In this paper we present an alternative method for the spectral analysis of a strictly stationary time series {Yt}t2Z. We define a “new” spectrum as the Fourier transform of the differences between copulas of the pairs (Yt, Yt−k) and the independence copula. This object is called copula...

This paper shows how high bargaining power for firms and search costs in the labor market can impede a switch towards new, more competitive economic activities. This is because search costs drive the quality of the horizontal matching between worker types and the old and new sectors of the...

We examine a hierarchical model where a principal hires a risk averse supervisor to monitor the e ort exerted by a productive agent. We assume that the supervisor can misreport the collected evidence without incurring any cost. We develop a corruption-proof contract which makes it sequentially...