This paper clarifies the differences in the alternative estimators of the error covariance matrix X in the SUR model with unequal numbers of observations. It identifies a sample statistic which represents their essential differences and hence is a useful guide for the choice of an estimator in practice. The paper also presents an alternative estimator of E based on the specification in Telser (1964).

Stock adjustment models of money demand have employed either the nominal or real adjustment process, but they have not been tested statistically due to their nonnestedness. This paper formulates a general stock adjustment model which includes both nominal and real adjustment processes as its nested subsets. Each process is then tested against the general specification. The paper also examines the homogeneity of money demand with respect to price level and income in the general model.

The quadratic Box-Cox approach is examined to determine its usefulness in demand research. In the absence of information about hedonic price and household demand structures, the flexible form is invaluable in both stages of the Rosen demand estimation procedure. The quadratic Box-Cox form permits a statistical investigation of a wide variety of specific hypotheses concerning specifications. Commonly-used functional forms in both the hedonic and demand stages are shown in the samples to be founded upon unacceptably restrictive hypotheses. The impact of changes in functional form upon demand-elasticity estimates and benefit estimates justify concern over the functional form-selection process. 8 references, 4 tables.

This article investigates the consequences of labor market search for the theory of hedonic wages. We find that the introduction of search has surprising consequences for the theory of hedonic wages. In particular, we demonstrate that the equilibrium distribution of wage and nonwage amenity bundles generally bears little resemblance to workers' underlying preferences. A consequence of this analysis is that estimates of workers' marginal willingness to pay, derived from the conventional hedonic wage methodology, are biased. In addition, we demonstrate that search generates differences between firm‐level and employee‐level data that can cause substantial deviations in the estimates of hedonic wage equations.

It is well known that the inability to observe workers' full labor market productivity can bias estimates of compensating wage differentials. This paper attempts to determine how serious this bias is likely to be. It adopts a stochastic framework of workers' tastes over job attributes and models their equilibrium wage-job attribute choices. Workers' productivity is assumed to consist of observed and unobserved components. Applying the standard estimation methodology, we find that the degree of bias can be surprisingly large. On the basis of our analysis, we conclude that contemporary labor market studies are likely to severely underestimate workers' willingness to pay for job attributes. This has implications for a number of applications of compensating wage differentials, including value of life studies.