Nicolas de Harlay, seigneur de Sancy Maximilien de Béthune, duc de Sully. Meanwhile he had been a second time converted to Catholicism, but his influence at court waned, and he retired from public life in 1605. He survived until 13 October 1629, leaving a "Discours sur l'occurrence des affaires". His son, Achille Harlay de Sancy (1581–1646), was bishop of Saint-Malo. The Sancy diamond's known history began circa 1570 in Constantinople when purchased by de Sancy. Something of a gem connoisseur, de Sancy used his knowledge to prosperous advantage. Henry III of France suffered from premature baldness and tried to conceal this fact by wearing a cap.
Vickrey auction mainly considered auctions where only a single, indivisible good is being sold. The terms "Vickrey auction" and "second-price sealed-bid auction" are, in this case only, equivalent and used interchangeably. When either a divisible good or multiple identical goods are sold in a single auction, however, these terms are used differently. Vickrey auctions are much studied in economic literature but uncommon in practice. Generalized variants of the Vickrey auction for multiunit auctions exist, such as the generalized second-price auction used in Google's and Yahoo!'s online advertisement programmes (not incentive compatible) and the Vickrey-Clarke-Grove Auction (incentive compatible). In a Vickrey auction with