a full week in October 2009.
Auctions were included in the dataset if they satisfied a number of
conditions. (1) They were included in a search for &quot;wii mario kart&quot; on
ebay.com, (2) items were in the Video Games &gt; Games &gt; Nintendo Wii section
of Ebay, (3) the listing was an auction and not exclusively a &quot;Buy it Now&quot;
listing (sellers sometimes offer an optional higher price for a buyer to end
bidding and win the auction immediately, which is an <em>optional</em> Buy it
Now auction),