If the futures price exceeds the future value of spot plus cost of carry, what would you want to do?
Assume that the future and the spot are both available to trade.
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The solution for this problem is : Sell the Future and Buy the Spot
Since the Future is trading at a premium (a price more than the 'Spot plus Cost of Carry') and at maturity the Future price and Spot price has to become the same, you sell the Future in the anticipation that its price drops down to the 'Spot plus Cost of Carry'. You also buy the Spot to cover your risk should the price of the Future rise and it is the Spot price that increases as per the market expectation and meets the Future price at Expiry. (Not to be confused, the price of the Future is the price of the Spot at expiry) This way, if the price of the Future drops down to meet the Spot, you stand to gain from the drop in Price of the Future as well as any increase in the Spot. Should the Spot also witness a Price drop, the gains made by selling the Future will cover you. If the price of the Future remain constant and the price of Spot increases towards expiry, you stand to make gains from your purchase of the Spot. If the Price of the Future too raises, your gains from the Spot will cover your losses from the Future.
As @Calvin Lin mentioned, this method is called an arbitrage where you cover your naked exposure / risk, by taking a contrary view / position at the same or different market, on the same stock or commodity.