This encouraged trading in tulips by all members of society; Mackay recounted people selling or trading their other possessions in order to speculate in the tulip market, such as an offer of 12 acres of land for one of two existing Semper Augustus bulbs, or a single bulb of the Viceroy that, Mackay claimed, was purchased in exchange for a basket of goods (shown in table) worth 2,500 florins.