When the Chinese do business, they buy before they sell. Atop the 'buy' character in Chinese is the character for 'four,' which means that one should buy something at 40 % of its market value. The upper part of the character for 'sell' can be broken down into the characters for the numbers 'ten,' 'one,' and 'four.'
華人做生意是先「買」後「賣」，「買」字上面是「四」，就是比市場價格低 4 成買進，「賣」的上面可拆成「十」、「一」、「四」，「十」就是賺，「一」、「四」是成數，也就是賣時賺 1 到 4 成即可。