Plants' entry and exit behaviour in Swedish municipalities are studied within a ®xed-e¨ect, integer-valued autoregressive model. Based on eight industrial sectors, 1985±1993, and all municipalities, models are estimated by a generalized method of moment estimator. In¯uences on entry and exit are systematic and spatially as well as temporally variable. Responses to explanatory variables di¨er between sectors. Average income, local unemployment and higher education are found to be important determinants of both entry and exit across sectors.

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