1. The difference between fund position cost and principal is the difference between unit and essence. I the former is a single copy, including income, and the latter is the original.

2. The position cost refers to the total transaction cost after trading a financial product or derivative (such as stock or futures) in batches for a period of time minus the floating profit and loss divided by the current holding quantity, that is, the (unit) position cost.

3. The principal is the original amount of the loan, deposit or investment before calculating the interest.