29Our calibration of ρ = 1  follows JEDC. We find, as previous work has found, that ρ  and β  are not sharply identifiable using methods of the kind we employ here. Our approach therefore is to set a value of one parameter (ρ  ) and estimate the other conditional on the assumed value of the first. (See section 4.4 for a sensitivity analysis with respect to several parameters including ρ  .)