If there is no transaction that day, the latest transaction price will be used as the closing price, because the closing price of gold is the standard of the market that day and the basis of the opening price of the next trading day, which can be used to predict the future gold market.
As an observable price in a trading day, the closing price of gold often reflects the attention of market funds to a stock and has the function of predicting the deductive direction of the next trading day, so the performance of the closing price deserves attention.