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Economic growth with bubbles
Martin, Alberto; Ventura, Jaume
Universitat Pompeu Fabra. Departament d'Economia i Empresa
We develop a stylized model of economic growth with bubbles. In this model, changes in investorsentiment lead to the appearance and collapse of macroeconomic bubbles or pyramid schemes.We show how these bubbles mitigate the effects of financial frictions. During bubbly episodes,unproductive investors demand bubbles while productive investors supply them. These transfersof resources improve the efficiency at which the economy operates, expanding consumption, thecapital stock and output. When bubbly episodes end, these transfers stop and consumption, thecapital stock and output contract. We characterize the stochastic equilibria of the model and arguethat they provide a natural way of introducing bubble shocks into business cycle models.
Macroeconomics and International Economics
dynamic inefficiency
economic growth
financial frictions
pyramid schemes
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