Position cost refers to the total transaction cost after trading a financial product or derivative product (such as stocks or futures) in batches for a period of time, minus floating gains and losses and divided by the current holding quantity, that is, position cost.

The main force refers to the main force, generally refers to the banker in the stock. Describe the existence of one or more price manipulators or institutions in a market or a stock to guide the market or stock price to run in a certain direction. There are great similarities between the main stock players and market makers.