Answer:
False
Explanation:
The bargaining power of suppliers (Term of Michael Porter) is a force that shapes the competitive structure of a market.
It represents the way of put pressure by raising the prices or lowering the quality or quantity of the product. This power makes the buyer profits decrease.
In your case, this is a policy set to the customer, and it is not increasing the price, decreasing quantity or lowering the quality.
It is more policy to induct loyalty from the customer to purchase again from the grocery store.