Mayan towns in the Guatemalan highlands hold markets on specific days of the week. A market is attended by local townspeople, by peasants residing in the town’s hinterland, and by vendors bringing wares from other towns. A market functions to bring in goods from other ecological zones, to...

Positive autocorrelation implies that proximate observations take on similar values. “Proximate” can be defined in many different dimensions. In a cross-section of nations, it can be defined using physical distance, cultural similarity, ecological similarity, or using frequency and intensity...

Positive autocorrelation implies that proximate observations take on similar values. “Proximate” can be defined in many different dimensions. In a cross-section of U.S. regions, it can be defined using physical distance, cultural similarity, ecological similarity, or using frequency and...