SLR Proxy
We use behavior-based measures to form the SLR proxies.
We focus on Internet booksellers in the data set that
received purchases; a retailer with only browsing activity
would correspond to an undefined SLR. Six retailers for
which we have pricing data had purchases in the panel data:
1Bookstreet.com, Amazon.com, B&N, Books-A-Million,
eCampus, and Varsity. Book purchases were made by 5304
unique panelists at these retailers over the six-month period.