Mundlak ("On the Pooling of Time Series and Cross-Section Data", Econometrica, Vol. 46 (1978),pp. 69-85) showed that when individual effects are correlated with the explanatory variables in an error component (EC) model, the GLS estimator is given by the within. In this paper we bring out some...

This paper revisits the issue of estimating import demand elasticities, by considering a variety of unobserved components in international commodity transactions. We use individual importers data on a highly disaggregated basis for a single importing country, Lebanon, to estimate a flexible AIDS...

Parametric aggregation of heterogeneous micro production technologies is discussed. A four-factor Cobb-Douglas function with normally distributed firm specific coefficients and with log-normal inputs (which agrees well with the available data) is specified. Since, if the number of micro units is...