How do gold shops such as Lao Fengxiang manipulate the prices of yellow and platinum jewelry?

Because the most important factor determining the price of gold ornaments is the operating cost coefficient, this operating cost naturally refers to the operating costs of gold ornaments production and operation enterprises and businesses in the previous year, including labor, packaging, taxation, rent, development, advertising, administrative management and other expenses. I don't know the specific coefficient calculation formula, but look at all the costs and expenses, which are not estimated by major enterprises themselves, and what else to say! As we all know, shops in gold shops are generally rented in prime locations, and the magic capital is also an inch of land, and the labor cost is said to be the highest in the country. These expenses only went up this year. As for other packaging, development, advertising and management expenses, they can only go up but not down. I guess this year's situation is like this. Since everyone is still facing huge losses, let's move the coefficient up by the way. I wanted to go back and wait for the price of gold to rise again, but this coefficient was transferred back; But who knows that after waiting for eight months, the price of gold is still 260. As for why this monopoly association can control the market for so many years by virtue of this "price self-discipline rule"; Look at the five shops that were finally fined: Laofengxiang Jewelry Store, Old Temple, Yayi, Huangcheng Jewelry, Tianbao Longfeng; Which Shanghai is not a century-old brand?