everytraders have different setting for this part because it depends to their needs in their trading but for this condition,they can set it up as their needs for high or lower and also depend to the money at their balance, and maybe if they have less capital then they can set the leverage with using 1 : 500 or 1 : 1000 and then they will get larger margin for their trading but if they get some losing and meet MC, so there is nothing left at their balance