Huang Ming-chien likens it to market supply and demand: If sales of Coca Cola drop, it doesn't mean that fewer people are drinking beverages. It could be that some people have switched to lemon tea or sports drinks.
黃明堅以市場供需比喻：假如今天可樂的銷售量下跌了，並不表示喝飲料的人少了，可能只是有些人改喝檸檬紅茶或運動飲料。