forex is market of money you can not say a big amount is enough for forex trading i think you can start with 1$ but there is no benefit i think if you have good knowledge and experience then you should start it with minimum 500$ you can earn reasonable profit with this amount.
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Yes when we invest large capital then we need be careful about our trading.We need to take small lot size when we are trading firstly then if we succeed in a small lot size then we can increase our lot size.Large capital mean that you have a secure trading with little risk.