Final answer:
A market penetration growth opportunity is a strategy directed at existing customers to increase market share by selling more of the existing products or services.
Step-by-step explanation:
A market penetration growth opportunity is a growth opportunity directed toward existing customers using the retailer's present retailing format. This strategy aims to increase market share by selling more of the existing products or services to the current customer base. It involves attracting new customers, encouraging customers to buy more frequently, or increasing the average transaction value.