You have two cows. You sell one and buy a bull. Your herd multiplies, and the economy grows. You sell them and retire on the income.

• 老派资本主义作风：你有两头奶牛。你卖掉其中一头，买了一头公牛。牛群得以繁殖，经济开始繁荣。这时你把它们全都卖掉，并以这笔收入养老。