Chain restaurants don't mean that they can't be flexible. For example, there are rice burgers in Japan, and rice is used instead of bread. All the onions in China are dried, and they are made with water when they arrive at the restaurant. Why can't Iceland? Are we the only people in China who will save costs regardless of quality and taste?

The product Big Mac is just a hamburger invented by McDonald's franchisees later. What if it is not sold? If it is over-standardized, regardless of the market demand and the company's profit balance, the business will only get smaller and smaller. The current situation in China and KFC illustrates this point.