Books reviewed: Walter Isard, History of Regional Science and the Regional Science Association International: The Beginnings and Early History Robert E. Lang, Edgeless Cities: Exploring the Elusive Metropolis Lori G. Kletzer, Imports, Exports, and Jobs: What Does Trade Mean for Employment and...

Using a simple stochastic growth model that nests both exogenous and endogenous growth, this paper shows that the growth rate should be mean stationary if growth is exogenous and difference stationary if growth is endogenous and any variable affecting the investment rate is difference...