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Supply: A Tale of Two Bubbles

To the extent that monetary policy influences asset prices, it does so via the demand for assets, by changing the borrowing costs to purchase assets, or via supply, where movements in interest rates can make investment in assets look more or less attractive. Fiscal policy interventions can also contribute to bubbles by changing the cost of acquiring specific assets. Most discussions of asset bubbles, particularly those involving the role of monetary policy, focus on demandside factors. This article examines the role of supply-side factors in the recent booms in the U.S. housing market and dot-com stocks. The importance of supply constraints in each market is discussed. Policy implications are then presented.