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Why having large capital is advantageous to trading
Excess capital is the primary means of navigating around a trade which is moving against you. In a very basic case, consider a long position moving against you. With additional capital you could average in as the price drops or you could write options against your position. If you don't have the capital to handle when (not if) a trade move against you then you're at a significant disadvantage as your only option may be a liquidation.