We analyze the impact on consumer prices of the size and bias of price comparison search engines.
In the context of a model related to Burdett and Judd (1983) and Varian (1980), we develop and
test experimentally several theoretical predictions. The experimental results confirm the model’s
predictions regarding the impact of the number of firms, and the type of bias of the search engine, but
reject the model’s predictions regarding changes in the size of the index. The explanatory power of
an econometric model for the price distributions is significantly improved when variables accounting
for risk attitudes are introduced
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