@Smart, our idea is to keep the business simple. We dont' want to start complicating by things like x brokerage for trading a particular contract. Also I guess you'd agree, the person who was buying 50 nifty, will still end up buying 50 nifty in one order.
Also, don't know if it makes any difference Rs 20 or Rs 10 in today's world where minimum coin in the Indian economy will probably be Rs 10.
If we are reducing any more, Hopefully we will find a way to reduce it to 0
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