International Evidence On
Sticky Consumption Growth
July 1, 2010
Christopher D. Carroll^{1} 
. 
Jiri Slacalek^{2} 
. 
Martin Sommer^{3} 
. 
_____________________________________________________________________________________
Abstract
This paper estimates the degree of ‘stickiness’ in aggregate consumption
growth (sometimes interpreted as reflecting consumption habits) for thirteen
advanced economies. We find that, after controlling for measurement
error, consumption growth has a high degree of autocorrelation, with
a stickiness parameter of about 0.7 on average across countries. The
stickyconsumptiongrowth model outperforms the random walk model of
Hall (1978), and typically fits the data better than the popular Campbell and
Mankiw (1989) model, though in a few countries the stickyconsumptiongrowth
and Campbell–Mankiw models work about equally well.
Consumption, Sticky Expectations, Habits
E21, F41
PDF:  http://www.econ2.jhu.edu/people/ccarroll/papers/cssIntlStickyC.pdf 
Web:  http://www.econ2.jhu.edu/people/ccarroll/papers/cssIntlStickyC/ 
Archive:  http://www.econ2.jhu.edu/people/ccarroll/papers/cssIntlStickyC.zip 
(Contains data and estimation software producing paper’s results) 
^{}
^{}
^{1}Carroll: Department of Economics, Johns Hopkins University, Baltimore, MD, http://www.econ2.jhu.edu/people/ccarroll/, ccarroll@jhu.edu, Phone: (410) 516 7602 ^{2}Slacalek: European Central Bank, Frankfurt am Main, Germany, http://www.slacalek.com/, jiri.slacalek@ecb.europa.eu, Phone: +49 69 1344 5047 ^{3}Sommer: International Monetary Fund, Washington, DC, http://martinsommeronline.googlepages.com/, msommer@imf.org, Phone: (202) 623 9998
A large literature ranging across macroeconomics, finance, and international economics has argued that ‘habit formation’ can explain many empirical facts related to consumption dynamics.^{2} The core empirical pattern driving all these findings appears to be that aggregate consumption growth is too ‘sticky’ to be explained with standard models. Other explanations for the persistence of aggregate spending growth, or ‘excess smoothness’ (in Campbell and Deaton (1989)’s terminology), include consumers’ inattentiveness to macroeconomic news (Sims (2003); Reis (2006); Carroll and Slacalek (2007)), or their inability to distinguish micro from macroeconomic shocks (Pischke (1995)). Further explanations could undoubtedly be imagined.
But a full consensus has not emerged on whether empirical data are irreconcilable with Hall (1978)’s benchmark random walk model of consumption. Hall’s model implies that consumption growth is unpredictable (excess smoothness is zero). However, standard extensions of the Hall model can generate some degree of stickiness in consumption growth. For example, excess smoothness might merely reflect the fact that spending decisions are made more frequently than consumption data are measured (Working (1960); this viewpoint has recently been advocated in papers by Ludvigson and Lettau (2001); Lettau and Ludvigson (2004)). Also, in the presence of uncertainty, the precautionary motive slows down consumers’ response to shocks, which could also explain part (though not all) of the excess smoothness (Ludvigson and Michaelides (2001)). Another possibility, not often mentioned but nevertheless worth serious consideration, is that the smoothness of measured spending reflects data construction methods (e.g. for components of spending for which quarterly observations are imputed using annual data sources). Finally, many of the papers in the habit formation literature have not carefully examined the possibility that their results might reflect the presence of some ‘ruleofthumb’ consumers, who simply set consumption equal to income in each period, as proposed in influential papers by Campbell and Mankiw (1989, 1991).
Motivated by this debate and by the fact that much of the empirical evidence on excess smoothness has come from a single country (the U.S.), this paper provides systematic estimates of three simple canonical models of consumption dynamics using data for all advanced economies for which we were able to construct appropriate datasets (thirteen countries in all). We compare the random walk model of Hall (1978) with two alternatives: the Campbell and Mankiw (1989) model, and a model that permits (but does not require) excess smoothness. We remain deliberately agnostic (in this paper) about whether such smoothness reflects habits, inattention, or other factors; our aim is simply to document the key stylized facts that should be matched by any model of aggregate consumption dynamics.
Using both instrumental variables (IV) (section 3.1) and Kalman filter structural (section 3.2) estimation methods, we find strong evidence of excess smoothness (‘stickiness’) in consumption growth in every country in our sample.^{3} Although there is some variation across countries in the estimated degree of stickiness, in every country we can reject the hypothesis that the stickiness coefficient is zero (the random walk theory), while in no country can we reject the hypothesis that it is 0.7 in quarterly data. Furthermore, wherever there is a clear distinction between the two nonrandomwalk models, the sticky consumption growth model outperforms the ruleofthumb model, usually by a decisive statistical margin. (In a few cases, the two nonrandomwalk models are not statistically distinguishable from each other.)^{4}
The large size of our estimated stickiness parameter may come as a surprise to some readers, because the serial correlation coefficient for spending growth in the raw data is much lower than 0.7 (for instance, in U.S. data the OLS estimate of the AR(1) coefficient for nondurables and services consumption growth is about 0.35). The discrepancy reflects our use of econometric methods that are robust to the presence of measurement error. Consistent with Sommer (2007)’s findings for the United States, our estimates suggest that in most countries at least half of the quarterly variation in consumption growth can be interpreted either as measurement error or as truly transitory spending disturbances unrelated to the theoretical consumption model (caused, for example, by unseasonal weather, which can have a nontrivial effect at the quarterly frequency in most countries).^{5}
The remainder of the paper is organized as follows. Section 2 outlines two theoretical frameworks that generate sticky consumption growth and provide the conceptual framework for our estimation strategy. Section 3 presents the main empirical results and Section 4 concludes.
This section sketches the two most popular theoretical frameworks—habit formation and sticky expectations—that can generate serial correlation in aggregate consumption growth. In the habit formation model, the serial correlation coefficient reflects the strength of habits (if , the model collapses to the Hall random walk model); in the sticky information model, is the fraction of aggregate expenditure by households that have not fully updated their information set about the latest macroeconomic developments (and again, corresponds to the Hall model). Because the implications of the two frameworks are indistinguishable in aggregate data, our empirical evidence is consistent with either model.^{6}
Muellbauer (1988) proposed a simple model of habit persistence, in which the representative consumer maximizes timenonseparable utility
 (1) 
subject to the usual transversality condition and the dynamic budget constraint:
 (2) 
where is the discount factor, is the consumption level, is market resources (net worth plus current income), is the constant interest factor, and is noncapital income. in (1) represents the ‘habit stock,’ i.e., the reference level of consumption to which the consumer compares the current consumption level. The parameter captures the strength of habits. After rewriting the utility function as , one can see that, for , the consumer derives utility from both the level and the change in consumption.
Dynan (2000) shows that for a habitforming consumer with Constant Relative Risk Aversion (CRRA) outer utility and , a first order approximation to the Euler equation leads to consumption dynamics that satisfy:
 (3) 
where mainly reflects innovations to lifetime resources.^{7} Hence, in contrast to the standard intertemporally separable utility specification, some of period ’s consumption growth is predictable at time , and the strength of habits can be measured directly by estimating an AR(1) regression like (3) on aggregate consumption data.
Carroll and Slacalek (2007) present an alternative model that also generates sticky aggregate consumption growth, but without departing from the conventional intertemporally separable utility specification. The key assumption is that consumers are mildly inattentive to macro developments—for example, some households do not immediately notice shocks to aggregate macroeconomic indicators such as productivity growth or the unemployment rate.^{8}
Assume that consumers maximize the discounted sum of time separable utility subject to the budget constraint (2). In a Hall (1978) model with quadratic utility, in which households use all available information, the optimal consumption level follows a random walk: . Numerical simulations in Carroll and Slacalek (2007) show that when quadratic utility is replaced with CRRA utility and the model is solved with realistic calibrations of idiosyncratic and aggregate uncertainty, the log of aggregate consumption is close to a random walk with drift (the drift reflects the precautionary motive and the attendant nonlinearities): .
Suppose now that the economy consists of a continuum of inattentive but otherwisestandard CRRAutility consumers, each of whom updates the information about his permanent income with probability in each period. For each consumer, this probability is assumed to be independent of the date when he last updated his information set (and independent of his income, wealth, or other characteristics). This assumption resembles firm behavior in Calvo (1983)’s model of price setting, which is commonly used in the monetary economics literature. Carroll and Slacalek (2007) show that the change in the log of aggregate consumption, , approximately follows an AR(1) process, whose autocorrelation coefficient approximates the share of consumers () who do not have uptodate information about macroeconomic developments. That is, consumption growth is well approximated by:^{9}
 (4) 
In addition, in the spirit of Akerlof and Yellen (1985) and Cochrane (1991), Carroll and Slacalek (2007) show that the utility loss from the infrequent updating of expectations is very small under standard calibrations of the model with per quarter.^{10}
This section tests the model of sticky consumption growth (3) and (4) against the alternatives of ruleofthumb behavior and the random walk hypothesis. The organizing framework for our empirical analysis is a specification for consumption growth from the excess sensitivity literature,^{11} which has been expanded here to include a term capturing stickiness of consumption growth:
 (5) 
where is household income and denotes the ratio of household (net) assets to permanent income. The first two righthand side regressors correspond to two of the tested theories of consumption behavior: inattentiveness or habit formation () and ruleofthumb consumers (). Under the third tested theory—the random walk hypothesis—the coefficients and should both be zero. The third term in the equation above () is included as a control—any of the three theories allow for some direct effect of asset holdings on consumption growth, either due to effects related to uncertainty (which induces a precautionary saving motive) or due to time variation in interest rates (which we assume is captured by time variation in ).^{12}
There are at least three reasons to expect the OLS estimates of coefficients in (5) to be biased and inconsistent. First, as argued by Wilcox (1992) and Sommer (2007), quarterly consumption data may be contaminated with substantial measurement error. Second is the undoubted existence of transitory spending disturbances such as those related to weather (or even, for some smaller countries, onetime events like the hosting of the Olympics). Standard theoretical models ignore these kinds of shocks, yet backoftheenvelope calculations suggest their effects could be substantial in quarterly data. Our final reason for expecting OLS to be biased is the wellknown problem of time aggregation.^{13}
We develop the points about importance of measurement error and transitory spending fluctuations using the United States as an example. The Bureau of Economic Analysis (2006) describes the methodology by which aggregate expenditures on nondurable goods are estimated using data on retail sales at a sample of retail outlets; since only a subset of retail stores are surveyed, the retail sales figures must contain sampling error. As an example of a “transitory disturbance,” under some plausible assumptions, Hurricane Katrina may have reduced quarterly personal consumption expenditure (PCE) growth by about 1 percentage point on an annualized basis in Q3:2005.^{14} However, even a much more benign event such as mild winter can reduce annualized quarterly consumption growth significantly—for instance, by about 1/4 percentage point in the United States in Q1:2006—through lower outlays on energy.
To address these three estimation issues (measurement error, transitory consumption, and time aggregation) in quarterly consumption data, we use two econometric methods. The first technique attempts to overcome these problems using instrumental variables estimation. As with any IV method, validity of the results depends on our ability to find suitable instruments (though the extensive literature on the predictability of consumption growth provides good candidates). As an alternative for those who dislike IV regressions, our second technique uses the Kalman filter and structural modeling assumptions to separate ‘true’ consumption growth from its transitory components and measurement error.^{15} In this case, the usual caveat applies: The validity of this maximum likelihood method hinges on the assumed structure of the stochastic processes for measurement error and ‘true’ consumption dynamics.^{16} We view the similarity between the results obtained from these two different methods, along with the coherence of our results with the large literature on habit formation in macroeconomics, as persuasive evidence that stickiness in consumption growth is a robust phenomenon.
Equation (5) is estimated using aggregate quarterly data for thirteen advanced economies ranging roughly over the past forty years (table 5 provides data details). Our preferred measure of consumption is the sum of expenditures on nondurable goods and services. However, this measure is available only for six countries in our sample (Canada, France, Germany, Italy, the U.K. and the U.S.); total personal consumption expenditures are therefore used for the other sample countries.^{17} Finally, and are measured as household disposable income and the ratio of financial wealth to disposable income, respectively.^{18}
The main advantage of IV estimation is that with appropriate instruments, there is no need to make assumptions about the stochastic structure of measurement error and other transitory fluctuations in quarterly consumption growth. The only requirements are that the instruments are uncorrelated with measurement error and temporary consumption fluctuations, but correlated with the instrumented variables.
Under habit formation or sticky expectations, Sommer (2007) shows that time aggregation makes “true” consumption growth (i.e., consumption growth without measurement error and transitory consumption) follow an ARMA(1,2) process:
 (6) 
where the s are complicated functions of . In addition, the MA(2) coefficient is close to zero for all reasonable values of , so that is approximately ARMA(1,1). Given these considerations, equation (5) can be estimated using the IV estimator with instruments lagged at least twice (e.g., dated as of time and earlier).^{19}
The baseline instrument set for the IV regressions consists of variables that are strongly correlated with consumption growth and yet unlikely to be correlated with measurement error: the unemployment rate, a longterm interest rate, and an index of price volatility.^{20} Consumer sentiment is also used as an instrument whenever available (the G7 countries and Australia), as in Carroll, Fuhrer, and Wilcox (1994) and others.
Table 1 summarizes the baseline estimation results for four alternative econometric specifications nested in equation (5).^{21} The left panel reports the results from univariate regressions in which each righthand side variable enters the estimated specification as the only regressor. The first column presents the IV estimates of consumption persistence , which are for all countries much higher than the (unreported) OLS estimates and are always highly statistically significant.^{22} The IV estimates of consumption persistence in table 1 are on average about 0.7—a strong rejection of the random walk proposition which implies a coefficient of zero. The second column reports p values of the null hypothesis implied by the heteroscedasticity and autocorrelation robust version of the conditional likelihood ratio (HARCLR) test of Andrews, Moreira, and Stock (2004). The test is robust to potentially weak instruments and is effectively uniformly most powerful among tests invariant to rotations of the instruments. The values indicate that the zero restriction on is soundly rejected in almost all countries.
The third column estimates the Campbell–Mankiw model. Our results are broadly consistent with the evidence presented in Campbell and Mankiw (1991): Ruleofthumb consumers (for whom, by assumption, consumption equals current income) are on average estimated to earn about of aggregate income. Interestingly, the estimates of in the left panel are often less significant than those of consumption persistence and are in three or four cases insignificant (depending on whether the standard or HARCLR p values are used). This means that—aside from the question of how the Campbell–Mankiw model stands up against the alternative of habit formation or sticky expectations—ruleofthumb spending behavior cannot be reliably detected in about a third of our sample countries.
The fifth column investigates the relative importance of wealth (expressed as the ratio of net financial assets to income) in aggregate consumption dynamics. The coefficient on the wealth–to–income ratio, , turns out to be statistically significant only in four countries, although the HARCLR values suggest more often that is not zero. In addition, the coefficient has in most countries the opposite sign to that predicted by either precautionary saving theory or intertemporal substitution as channelled through the interest rate. This is unsurprising for at least two reasons. First, the overwhelming significance of consumption (and also income) in the previous regressions implies a severe omittedvariable bias problem with the univariate regression that only includes wealth. Second, the previous literature generally finds little evidence of interest rate or precautionary saving effects in aggregate consumption growth data.^{23}
The last column of the left panel displays the adjusted s from the firststage regressions of consumption growth on instruments (denoted ). This measure of the strength of instruments ranges between 0.1 and 0.2 for most countries.^{24} ^{25}
The right panel of table 1 reports estimation results when all three regressors are included in equation (5). The results strongly suggest that past consumption growth is by far the strongest predictor of current consumption growth. The average persistence parameter in the country regressions falls only very slightly compared with the average estimates from univariate regressions reported in the left panel (from to ) and remains statistically significant at the five percent level in ten of our thirteen countries. The predicted income growth term dominates the lagged consumption term only in one country, Germany.^{26} The last column of the right panel reports the pvalues of the Hansen’s overidentification test—results of which imply that the null of instrument exogeneity cannot be rejected.
Table 2 averages the coefficient estimates from table 1 across various country groups. As in table 1, while the average consumption persistence falls relatively little after income and wealth are added to the estimated equations (compare the right and left panels of the table), the income and wealth coefficients become essentially zero. The result holds for all five groups of countries reported in the table which suggests considerable homogeneity in among advanced economies, a fact already apparent in the previous table with the results for individual countries.
Table 3, whose format is identical to table 1, estimates aggregate consumption dynamics with an alternative instrument set, in which longrun interest rates and price volatility have been replaced with income growth and the interestrate spread.^{27}
The estimation results are broadly consistent with our baseline: (i) the coefficient on lagged consumption growth in univariate regressions is large and significant for ten countries, (ii) in the regressions that include all three regressors, the coefficients on instrumented income growth and wealth tend to be small and less often statistically significant compared with univariate regressions, and (iii) lagged consumption growth beats lagged income in nine horserace regressions (but gets badly beaten in German data).
As a more efficient alternative to IV, we also estimate the dynamics of consumption growth using the Kalman filter. To proceed, it is necessary to specify an assumption about the stochastic process of measurement error. We follow the methodology of Sommer (2007) and assume that measurement error in the loglevel of consumption follows an MA(1) process.^{28} Observed consumption growth, , can be written as the sum of ‘true’ consumption growth, , and a measurement error, , as follows:
As noted above, s are not free parameters but are complicated functions of . The Kalman filter jointly estimates the sticky expectations coefficient and the degree of the first autocorrelation in measurement errors, . The filter also generates separate estimates of ‘true’ consumption growth, , and the measurement error component, . For the purposes of this subsection, we assume that the correlation structure of measurement error remains unchanged over the sample period.
The model described in equations (7) and (8) has been rewritten in a statespace form (see appendix B) and estimated using consumption data for the countries in our dataset (listed in table 5). Table 4 presents the estimation results. As in the case of the IV estimation, the coefficient reflecting consumption growth stickiness, , is large and highly statistically significant in almost all sample countries. The value of typically ranges between 0.6 and 0.8, with only Denmark and the United Kingdom having coefficients estimated below 0.4. For the United States, the estimated consumption persistence is about 0.7, which is consistent with previous studies (e.g. Fuhrer (2000)).
It is encouraging that the Kalman filter estimates of consumption persistence tend to be close to the IV estimates. This suggests that stickiness of consumption growth is a robust feature of the data that appears similarly even when viewed through quite different lenses.
The estimation results also suggest that measurement error in the level of consumption is positively and significantly autocorrelated in about half of our sample countries—a fact that is not surprising given the interpolation techniques that are often used by statistical agencies when constructing quarterly consumption data.
The Kalman filter’s estimate of “true” consumption growth, , is presented, along with the raw data, in figures 1 and 2. The Kalman filter estimation suggests that the share of transitory components in published quarterly consumption data is large (about 50 percent for the United States and even more for some countries).^{29} To see how the restrictions on s imposed by the theoretical model with habits affect estimates of , we have also experimented with several versions of model (7)–(8) in which s are free parameters (rather than known functions of ). In such models, consumption sluggishness robustly turns out to be similar to the values shown in Table 4. However, the fact that in a few cases s appear unrealistic (greater than one or smaller than minus one) suggests that imposing theoretical restrictions is helpful in identifying them (rather than ).
The statespace representation (7)–(8) fits nicely into the structural DSGE framework recently proposed by Ireland (2004), who estimates a small loglinearized model with the Kalman filter. Control variables in his model can be solved in terms of state variables and residuals :
 (9) 
Ireland, p. 1210 views the disturbances as follows: “the residuals [] may … soak up both measurement errors, but they can be interpreted more liberally as capturing all of the movements and comovements in the data that the real business cycle model, because of its elegance and simplicity, cannot explain.” Once we plug our transition equation for consumption growth (8) into the measurement equation (7), the Kalman filter model we estimate above has exactly the structure (9) with , , and .
Thus the statespace representation (7)–(8) can be interpreted as a strippeddown version of Ireland’s model with consumption habits in which measured consumption is affected by a combination of measurement errors and shocks to “true” consumption . As our main goal is to estimate consumption stickiness , we do not take a stand on where the consumption shocks come from (be it news about income, wealth, interest rates, fiscal policy or something else). Our model is simple enough to be estimable using classical techniques, including the maximum likelihood estimator, so that data have complete control over the estimates of , in contrast to largerscale DSGE models, which are often inevitably estimated with Bayesian methods with informative priors.
Hall (1978) provided macroeconomists with a clean theoretical benchmark to which actual consumption data could be compared: Consumption growth should be essentially unpredictable. In contrast with this benchmark, we find that, when econometric techniques that account for measurement error are used, consumption growth exhibits a high degree of persistence or “momentum.” The stickiness of aggregate consumption growth can be interpreted as reflecting the behavior of fully informed households with a strong consumption habit, or the behavior of an aggregate economy in which households are not always perfectly up to date in their knowledge of macroeconomic developments. Fitting the model to data from thirteen countries, we estimate that consumption growth persistence is always significantly above the randomwalk benchmark of 0 and is never robustly different from about 0.7. Our analysis also suggests that, on balance, the model of sticky consumption growth describes aggregate consumption data better than the ruleofthumb model of Campbell and Mankiw (1989), although our point estimates do typically indicate that a modest proportion of aggregate income (in the range of 10–20 percent) may be received by households who consume their current income every quarter.^{30}
Our findings imply that the large literature claiming to find evidence of sticky consumption growth in the U.S. probably cannot be explained away as reflecting time aggregation problems or other mistreatment of the data, suggesting that many of the insights gleaned from that literature are likely applicable to other countries as well. (However, it is worth bearing in mind that analyses that rely heavily on the literal interpretation of the habitsintheutilityfunction framework, such as calculations of the welfare cost of aggregate fluctuations, may not hold up under alternative interpretations of consumption growth stickiness.)
Our analysis also strengthens a key policy message about the sluggish average response of consumption to monetary and fiscal policy innovations highlighted earlier in the context of the habit formation literature—an important policy consideration at the current cyclical juncture in many countries, including in the United States.
Estimation with  Estimation with  
one regressor only  all three regressors
 
CLR p val  CLR p val  CLR p val  Country  OID
 
Canada  France  Germany  Italy  United Kingdom  United States  Mean G7  –  –  –  –  –
 
Australia  Belgium  Denmark  Finland  Netherlands  Spain  Sweden  Mean Other  –  –  –  –  –
 
Notes: Left Panel: Regressions were estimated with one regressor only. Right Panel: Regressions were estimated with all three regressors. : p value of the null hypothesis that the parameter equals 0 tested using the HAC robust version of the conditional likelihood ratio (HARCLR) test of Andrews, Moreira, and Stock (2004), window: 4 lags. Consumption variable: : nondurables, semidurables and services consumption, : total personal consumption expenditure, : ratio of household financial wealth to income. Statistical significance at percent (using robust standard errors). : Adjusted from the firststage regression of consumption growth on instruments. OID: pvalue from the Hansen’s statistic for overidentification.
Estimation with  Estimation with  
one regressor only  all three regressors
 
Country  
All Countries  G7 Countries  Anglo–Saxon  Euro Area  European Union 
Notes: Instruments: Lags and of the unemployment rate, longrun interest rate, price volatility and consumer
sentiment. Left Panel: Regressions were estimated with one regressor only. Right Panel: Regressions were estimated with all three
regressors. Robust standard errors are in parentheses. Statistical significance at percent. Standard errors
are simple averages of individual countries in a given group.
All countries: Canada, France, Germany, Italy, the United Kingdom, the United States, Australia, Belgium, Denmark, Finland, the
Netherlands, Spain, Sweden. G7 countries: Canada, France, Germany, Italy, the United Kingdom, the United States. Anglo–Saxon
Countries: Australia, Canada, the United Kingdom, the United States. Euro Area Countries: France, Germany, Italy, Belgium,
Finland, the Netherlands, Spain. European Union: France, Germany, Italy, the United Kingdom, Belgium, Denmark, Finland, the
Netherlands, Spain, Sweden.
Estimation with  Estimation with  
one regressor only  all three regressors
 
CLR p val  CLR p val  CLR p val  Country  OID
 
Canada  France  Germany  Italy  United Kingdom  United States  Mean G7  –  –  –  –  –
 
Australia  Belgium  Denmark  Finland  Netherlands  Spain  Sweden  Mean Other  –  –  –  –  –
 
Notes: Left Panel: Regressions were estimated with one regressor only. Right Panel: Regressions were estimated with all three regressors. : p value of the null hypothesis that the parameter equals 0 tested using the HAC robust version of the conditional likelihood ratio (HARCLR) test of Andrews, Moreira, and Stock (2004), window: 4 lags. Consumption variable: : nondurables, semidurables and services consumption, : total personal consumption expenditure, : ratio of household financial wealth to income. Statistical significance at percent (using robust standard errors). : Adjusted from the firststage regression of consumption growth on instruments. OID: pvalue from the Hansen’s statistic for overidentification.
Parameter Estimates
 
Country  
G7 Countries  
Canada  France  Germany  Italy  United Kingdom  United States  
Australia  Belgium  Denmark  Finland  Netherlands  Spain  Sweden 
Notes: Consumption variable: : nondurables, semidurables and services consumption, : total personal consumption expenditure. Statistical significance at percent.
Data for the G7 economies are from the Haver Analytics database. Data for other countries are from the database of the NiGEM model of the NIESR Institute, London. The original sources for most of these data are OECD, Eurostat, national statistical offices and central banks. Income is measured as personal disposable income. Wealth is approximated using data on the net financial wealth. All series were deflated with consumption deflators and expressed in per capita terms. The population series are from DRI International and were interpolated from annual data to quarterly observations. Japan is not included in our sample as creating a quarterly dataset with consumption data going prior to 1980 would involve splicing consumption series based on three very different methodologies. Adjustments to the Japanese national accounts methodology in 2002 and 2004 have significantly improved the reliability of quarterly consumption series but the currentmethodology data are only available since Q1:1994 (International Monetary Fund (2006)).
We thank Roberto Golinelli for consumer sentiment series for G7 countries and Australia used (and described in detail) in Golinelli and Parigi (2004). (We have not used consumer sentiment series for the remaining countries, because the data are not available before 1985.) We are grateful to Carol Bertaut and Nathalie Girouard for providing us with the data used in Bertaut (2002) and Catte, Girouard, Price, and Andre (2004), respectively. Ray Barrell, Amanda Choy and Robert Metz answered our questions about the NiGEM’s database.
Country  Time Frame  Consumption/Source  Income/Source  Wealth/Source 
G7 Countries
 
Canada  Q4:1970–Q3:2002  NDS/Haver  PDI/Haver  NFW/NiGEM 
France  Q1:1985–Q4:2003  NDS/Haver  PDI/Haver  NFW/NiGEM 
Germany  Q4:1975–Q4:2002  NDS/Haver  PDI/Haver  NFW/NiGEM 
Italy  Q1:1981–Q4:2003  NDS/Haver  PDI/Haver  NFW/NiGEM 
United Kingdom  Q1:1974–Q4:2003  NDS/Haver  PDI/Haver  NFW/NiGEM 
United States  Q3:1962–Q2:2004  NDS/Haver  PDI/Haver  NFW/NiGEM 
Other Countries
 
Australia  Q4:1975–Q4:1999  PCE/Haver  PDI/Haver  NFW/NiGEM 
Belgium  Q2:1980–Q4:2002  PCE/NiGEM&MEI  PDI/NiGEM&MEI  NFW/NiGEM 
Denmark  Q1:1977–Q2:2003  PCE/NiGEM&MEI  PDI/NiGEM&MEI  NFW/NiGEM 
Finland  Q3:1973–Q2:2003  PCE/NiGEM&MEI  PDI/NiGEM&MEI  NFW/NiGEM 
Netherlands  Q1:1975–Q4:2002  PCE/NiGEM&MEI  PDI/NiGEM&MEI  NFW/NiGEM 
Spain  Q1:1978–Q4:1999  PCE/NiGEM&MEI  PDI/NiGEM&MEI  NFW/NiGEM 
Sweden  Q1:1977–Q4:2002  PCE/NiGEM&MEI  PDI/NiGEM&MEI  NFW/NiGEM 
Notes: PCETotal personal consumption expenditures, NDSNondurables and services, PDIPersonal disposable income, NFWNet financial wealth, : Regressions for Germany were estimated with a reunification dummy in Q1:1991; Source: Haver—Haver Analytics, NiGEM—Database of the NiGEM model of the NIESR Institute, London, MEI—Main Economic Indicators of OECD.
Following Sommer (2007), equations (7) and (8) can be rewritten in the statespace form with the measurement equation:

and the stateevolution equation:

and with the associated covariance matrices and

respectively.
The statespace form is estimated with the Kalman filter using the consumption series described in table 5. The coefficients and are not free parameters but instead depend on the consumption persistence coefficient : . Our Kalman filter estimation incorporates this relationship between , , and .
Figures 1 and 2 display the measured consumption growth and true consumption estimated using the Kalman smoother based on the above statespace model.
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