When the Changs, father and son, started dealing in shells, they didn't understand the market. Not knowing which shells to pick, they took everything: "A sack of shells for a case of whiskey." In that way the Chang family would acquire more than 10,000 shells.
剛開始兼作貝殼買賣的張福全父子，不懂貝殼行情，也不知如何挑選貝殼，因此什麼貝殼都收，「一袋貝殼換一箱唯士比，」就這樣為張家累積了上萬顆貝殼。