$ From the "work circumstance" you liquidate the portfolio at $t_1$ realising its PnL (let me simplify the notation somewhat) Trader A has created some significant PnL, meanwhile Trader B arrives out with nothing in any way and his skipped out on volatility through the investing day which he could've https://cruzwbdgi.theideasblog.com/34616277/the-pnl-diaries