A DMP MODEL OF INTERCITY TRADE
... matching eﬃciency. Simon (1988) argues that the more industrially diversiﬁed a city is the
lower its frictional unemployment. He does not model the urban economy as such. Coulson
(2006) points to a comparison of three MSAs, Los Angeles, CA, Detroit, MI, and San Jose,
CA over the period 1956–2002 [ib ...