I think it's complete related to your capital. I can determine which trades I can determine to be able to determine how many lots I put on a regular customer as a trade or I use my monay management considerations in trading as I do to determine how the losses and profits that I experienced. Everyone in the Forex market is not trading on the market with the same lot size with the best lot size for trades with vary for each trader and depending on account size or balance, trading strategy, risk management, stop loss amount, leverage etc.