NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

Real Estate Bubbles and Urban Development

Edward L. Glaeser

NBER Working Paper No. 22997
Issued in December 2016
NBER Program(s):Development Economics

Why are real estate bubbles so common? Can these bubbles actually do some good? Real estate booms have regularly occurred throughout the world leaving painful busts and financial crises in their wake. This paper suggests that real estate is a natural investment for more passive debt investors, including banks, because real estate’s flexibility makes it better collateral than specifically built production facilities. Passive capital’s preference for real estate will be particularly strong when agency problems bedevil equity investments. Consequently, passive capital may flow disproportionately into real estate and the errors of passive capital can generate real estate bubbles. The preference of banks for more fungible real estate assets can also explain why real estate is so often the source of financial crises. In principle, real estate bubbles can be welfare enhancing, if cities would otherwise be too small either because of agglomeration economies or building restrictions. But given reasonable parameter values, the large welfare cost of any financial crisis associated with a real estate bubble is likely to be much higher than the modest benefits of extra building. The benefits of real estate bubbles are welfare “triangles” while the costs of widespread default are welfare “rectangles,” which is why bubbles rarely appear to be benign events.

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Document Object Identifier (DOI): 10.3386/w22997

Published: Edward L. Glaeser, 2017. "Real Estate Bubbles and Urban Development," Asian Development Review, vol 34(2), pages 114-151.

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