The Future of Prediction: How Google Searches Foreshadow Housing Prices and Sales

Lynn Wu, Erik Brynjolfsson

This chapter is a preliminary draft unless otherwise noted. It may not have been subjected to the formal review process of the NBER. This page will be updated as the chapter is revised.

Chapter in forthcoming NBER book Economic Analysis of the Digital Economy, Avi Goldfarb, Shane Greenstein, and Catherine Tucker, editors
Conference held June 6-7, 2013
Forthcoming from University of Chicago Press

We demonstrate how data from search engines such as Google provide an accurate but simple way to predict future business activities. Applying our methodology to predict housing market trends, we find that a housing search index is strongly predictive of future housing market sales and prices. For state-level predictions in the United States, the use of search data produces out-of-sample predictions with a smaller mean absolute error than the baseline model that uses conventional data but lacks search data. Furthermore, we find that our simple model of using search frequencies beat the predictions published by experts from the National Association of Realtors by 23.6% for future US home sales. We also demonstrate how these data can be used in other markets, such as home appliance sales. This type of "nanoeconomic" data can transform prediction in numerous markets, thereby improving business and consumer decision making.

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This paper was revised on May 27, 2014

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