The solid dot
is the estimate for all categories pooled together(Einav et al. 2015).
0
2
In other words, Einav and colleagues were interested in and capable of studying online auctions.
0
3
Thus,
rather than comparing the final price for all auctions with a given starting price, Einav and colleagues compared within matched sets.
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4
For example,
by limiting their research to items that had multiple listings Einav and colleagues are focusing on professional and semi-professional sellers.