Which type of promotion do retailers use to encourage repeat purchasing from customers?

Question

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Frequent-shopper programs are designed particularly to encourage repeat purchases from customers. Customers are provided incentives, rewards, or discounts of some sort for making purchases from the retailer regularly. This technique not only results in customer loyalty but also helps the retailer maintain and increase sales. The other options, such as coupons, price deals, premiums, and samples, may encourage initial purchases but may not be as effective at ensuring repeat purchases.

Which Type of Promotion Do Retailers Use to Encourage Repeat