Unlike equity market where one can buy/sell even one stock, derivatives are traded on minimum lot size basis with Rs 5 lakh as the minimum notional value.For example, in case of NIFTY futures, the current index of about 10,500 represents the notional value of one unit. With one lot comprising of 75 units,minimum exposure in NIFTY futures works out to about Rs 7.9 lakh. However, thetrader only needs to put-in the margin money, roughly around Rs 90,000 and not the entire amount.