“…To show that q P decreases, assume to the contrary that q P 31 As pointed out by many writers, it would be very desirable to have a full-fledged model of the discriminatory auction incorporating heterogeneity of bidders, incomplete information, and non-linear valuations. This might allow to explain further interesting empirical observations as reported, e.g., in ECB [19], Bindseil, Nyborg, and Strebulaev [10], Breitung and Nautz [11], Linzert, Nautz, and Bindseil [41], and Bruno, Ordine, and Scalia [12]. In Ewerhart, Cassola, and Valla [29], we develop such a model for the case of the fixed rate tender.…”