Final answer:
Paying retailers to get shelf space is an example of trade promotion where manufacturers offer incentives to retailers or distributors in order to increase sales and promote their products.
Step-by-step explanation:
This is an example of trade promotion. Trade promotion is a type of promotion where manufacturers offer incentives to retailers or distributors in order to increase sales and promote their products. Paying retailers to get shelf space is one form of trade promotion, as it helps manufacturers to have their products prominently displayed and increases the likelihood of the products being noticed and purchased by consumers. Manufacturers consider these payments as an investment to ensure their products are accessible to consumers.