Margin refers the amount of investment lest in a trader’s account or the margin which he invested. A definite amount of investment or margin needed if a trader wants to trade here. If he doesn’t manage to have it on his account he might not get the authority of trading. Margin level can get higher with leverage power. I get 2000:1 leverage from my broker AAFX. It reinforce my original margin level up to 2000 times bigger while trading.