Quote from walterjennings:
total profit at the end of the day is equal to sum(notional_sell_prices) - sum(notional_buy_prices). how does having buys or sells on different accounts have ANY effect on end of day profit. my current understanding is that long and short on the _same_ security at a single time is all smoke and mirrors. totally useless.
Quote from scriabinop23:
useless unless you have some multi time frame system that scalps on minute bars and does longer term positions on other length (more minutes, hours, days, weeks/etc) bars.
realistically? lets say you are short a long term position on a stock, but want to trade in and out of it when you see an opportunity (ie you are short amazon, but the signals all point to buy in the very short term). Then it makes more sense.
Quote from walterjennings:
work it out on paper. trying the long term on one account and the short term on another account works out to the EXACT same as trying both on a single account (exiting and reentering the 'long' position at a better price a based on the short term signal).