This study uses intraday when-issued rate quotes to examine the rewards and risks of the Treasury coupon auctions for bidders who face different tradeoffs between the winner's curse and quantity risk. The data indicate that markups of auction average rates over bid when-issued rates at auction times average 3/8 basis point. I also find that when-issued rates react as strongly to bidding aggressiveness at auctions before the auction results are announced as theydo afterward, and that quantity risk is as important as the winner's curse.

This study examines the Treasury's experiment with single-price bond auctions in the mid-1970s and finds that, controlling for factors unrelated to auction technique, markups of auction average rates over when-issued rates shortly after auctions were a statistically significant seven to eight basis points higher at single-price auctions than at discriminating-price auctions. These results suggest that single-price auctions raised Treasury borrowing costs by roughly 3/4 percent of the issuing price of auctioned securities.