See a trader earn via compoundly. What this line means if a trader earns 1k a month next month he can earn 5k or 10k. But also lossess also occur like this if he has not able to make profits.
So the basic question is that how actually the money grows?
See everyone thinks money grows very rapidly. But no one counts loss and expenses out of their daily life. If capital is small so growing fast is a challenging task. Because the earning potential is solely depend on the capital.
Trader simply grows by earning more and increasing his or her capital size to earn more and when his or her capital grows to a good level then there will be his trading money will grow.