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； It is necessary to check P&L statements from unique accounting intervals, as any alterations after a while turn into additional significant compared to quantities by themselves. On ne transform rien à ce qui est en prepare de se passer, mais on modifie seulement son sens. En PNL, on distingue https://pnl33097.ltfblog.com/33154901/the-pnl-diaries