We present a new method for imposing and testing concavity of a cost function using asymptotic least squares, which can easily be implemented even for cost functions which are nonlinear in parameters. We provide an illustration on the basis of a (generalized) Box-Cox cost function with six...

Not only has the shadow economy obviously been growing much more rapidly than the official economy in the Western industrialised countries, it also appears to have a growth cycle of its own, running counter to the official economy's growth cycle. This raises a number of important questions for...

This paper develops a unified model of dual and unitary job holding based on a Stone-Geary utility function. The model incorporates both constrained and unconstrained labor supply. Panel data methods are adapted to accommodate unobserved heterogeneity and multinomial selection into 6 mutually...

This paper examines the impact of job search methods on the output of the job search process in a segmented labor market. Theoretical models of job search, like the widely used search approach, generally contain only one parameter capturing all possible factors affecting the efficiency of...

Do firms employing undocumented workers have a competitive advantage? Using administrative data from the state of Georgia, this paper investigates the incidence of undocumented worker employment across firms and how it affects firm survival. Firms are found to engage in herding behavior, being...

Why do not people evade more taxes when their gain from evasion is higher than the expected penalties? Why does only a small minority evade when a large majority is willing to? These tax evasion puzzles are explained in a labour market framework where employees may combine reported work in firms...

We investigate the impact of the imposition of sanctions for employing illegal migrants on the welfare of native workers. Our analysis is based on the premise that in response to such sanctions, managers in a firm may be reassigned from supervision of production to verification of the legality...