If the stock price instead increases by less than $ or falls, your loss will be limited to the price you paid for the option ($600) and this loss will be at least partially offset by the earned interest on your T-bill plus the premium you receive from closing out your position by selling the option, if you choose to do so. III. Buying calls to lock in a stock purchase price An investor who sees an attractive stock price but does not have sufficient cash flow to buy at the present time can use call options to lock in the purchase price for as far.
