NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

Panel Data Hedonics: Rosen's First Stage and Difference-in-Differences as "Sufficient Statistics"

H. Spencer Banzhaf

NBER Working Paper No. 21485
Issued in August 2015
NBER Program(s):EEE, PE

For decades, economists have used the hedonic model to estimate demands for the implicit characteristics of differentiated commodities. The traditional cross-sectional approach can recover marginal willingness to pay for characteristics, but has faltered over a difficult endogeneity problem for non-marginal welfare measures. I show that when marginal prices can be reliably estimated, and when panel data on household demands is available, one can construct a second-order approximation to non-marginal welfare measures using only the first-stage marginal prices. Under a single-crossing restriction, the approach remains valid for repeated cross sections of product prices.

More recently, economists have questioned the assumptions under which one can identify these cross-sectional hedonic price functions, raising the possibility of unobservables that are correlated with the characteristic of interest. To overcome this problem, they have introduced difference-in-differences econometric models to identify capitalization effects. Unfortunately, the interpretation of these effects has not been clearly perceived in the literature. I additionally show these capitalization effects are the "average direct unmediated effect" on prices of a change in characteristics, which can be interpreted as a movement along the ex post hedonic price func-tion. This effect is a lower bound on Hicksian equivalent surplus.

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Document Object Identifier (DOI): 10.3386/w21485

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