Although it is frequent, discontinuous (leapfrog) development has rarely been addressed by the literature, because traditional models are unable to conceive diverse urban forms. This article is a survey of theoretical explanations of discontinuous development. It follows two parts. First, taking...

Although it is frequent, discontinuous (leapfrog) development has rarely been addressed by the literature, because traditional models are unable to conceive diverse urban forms. This article is a survey of theoretical explanations of discontinuous development. It follows two parts. First, taking...

This paper investigates the causality between prices and index-based trading activity for twelve grain, livestock, and other soft commodity futures markets. We use panel Granger causality estimations based on SUR systems and Wald tests with market-specific bootstrap critical values. This...