If transaction costs are not taken into account, your buying price is your guaranteed price; because sales and purchases incur taxes and fees, according to current standards, the guaranteed price is basically the buying price* (1+1.2%). In other words, you will make money by selling when the stock rises by more than 1.2%.

Diluted cost price: For example, if you buy 1,000 shares of a stock for 10 yuan, but it falls, you can continue to buy a part (for example, buy 800 shares for 9.5 yuan again). At this time, your cost price is: (10* 1009.5*800)/1800 (this calculation ignores transaction fees), so your cost is lower than when you first bought it, and you can unwind faster