This paper tests the feasibility and empirical implications of a spatial econometric model with a full set of interaction effects and weight matrix defined as an equally weighted group interaction matrix applied to research productivity of individuals. We also elaborate two extensions of this...

Suppose that the Ordinary Least Squares regressors X follow a vector Ornstein-Uhlenbeck process, with growth matrix bA. The limiting sample variance matrix V is of interest. If A=kI, k[greater-or-equal, slanted]0, then [not partial differential]V/[not partial differential]b[greater-or-equal,...

This paper examines the effects of union change in Britain on changes in earnings dispersion 1983–1995. We investigate not only the decline in union density but also the greater wage compression among unionised workers, as well as changes in union density across skill groups. For the private...

Ninety-three world-wide inflation series are tested for unit roots. Treating the data series' innovations as draws from a symmetric stable distribution, with possibly infinite variance, reduces the number that appear stationary.