Some marketer wants to improve their selling with giving a present to the customer. But they are also afraid they will get loss. That thing can happen because they do not know the effective way. Giving a present without an effective way can give your business a big loss.
There is a way that you can give a present effectively. Find a present that looks expensive. If it is possible, look for a present that exclusive and others do not have it. Then give a rule or sales program for customer who wants to get that present. For example, for some amount of buying, buyers can buy the present “cheaper” (That price is cheaper than normal price, but still more expensive than bought price).