The purpose of the P&L assertion is to point out a corporation’s revenues and expenditures in excess of a specified period of time, typically about one fiscal yr. 单向双向：某些产品的手续费只在开仓时收取，有些则在开仓和平仓时都收取； On ne improve rien à ce qui est en practice de se passer, mais on modifie seulement son sens. En PNL, https://gogogobookmarks.com/story19298300/5-essential-elements-for-pnl