Online Appendix for Controlling Unobserved Heterogeneity in Repeat Sales Models: Application to Anchoring to Purchase Price
34 Pages Posted: 5 Feb 2019 Last revised: 5 Dec 2019
Date Written: March 21, 2019
Abstract
This is the Online Appendix for: Controlling Unobserved Heterogeneity in Repeat Sales Models: Application to Anchoring to Purchase Price
Stocks, art, automobiles, housing, corporate bonds and other assets are often studied in a repeat sales framework in order to control unobserved heterogeneity. But unobserved variables that influence both first and second sales remain a troubling source of omitted heterogeneity for a large group of two-stage repeat sales models. We develop a simulation algorithm to correct omitted variable bias. Our algorithm is based on a function of the variance of the unobserved as a proportion of a measurable value: the total variance of unobserved plus random noise associated with the first sale.
We illustrate our model with an application to seller anchoring to the price paid for a house. Our simulation results suggest that premiums on expected losses are reduced by about 50% compared to conventional models, as expected if our algorithm reduces unobserved heterogeneity. We use property tax assessed value data to control endogeneity and to validate our simulation algorithm. Our algorithm can be estimated with standard hedonic data and it is relevant to many two-stage studies, including boundary effects models, studies of credit spreads in bond markets and firm acquisitions.
Keywords: Repeat Sales, Unobserved Heterogeneity, Simulation Algorithm, Anchoring, Loss Aversion
JEL Classification: C1, E00, R3
Suggested Citation: Suggested Citation