This paper describes a simple method of calculating a heteroskedasticity and autocorrelation consistent covariance … matrix that is positive semi-definite by construction. It also establishes consistency of the estimated covariance matrix …

This paper describes a simple method of calculating a heteroskedasticity and autocorrelation consistent covariance … matrix that is positive semi-definite by construction. It also establishes consistency of the estimated covariance matrix …

for correct welfare comparisons. We consider general heterogenous demand where preferences and linear budget sets are …

for correct welfare comparisons. We consider general heterogenous demand where preferences and linear budget sets are …

for correct welfare comparisons. We consider general heterogenous demand where preferences and linear budget sets are …

characterize the efficient moment condition for a given first step nonparametric estimator. We also show how it is possible to … approximately attain efficiency by combining many moment conditions. In addition we find that the efficient moment condition often … leads to an estimator that attains the semiparametric efficiency bound. As illustrations we consider models with …