Final answer:
To increase sales to existing customers through innovative approaches, Papa Tom's Pizza should primarily adopt the Market Penetration strategic approach.
Step-by-step explanation:
To increase sales to existing customers through innovative pricing, promotion, or distribution strategies, Papa Tom's Pizza should primarily adopt the Market Penetration strategic approach.
Market penetration involves focusing on selling more of the existing products to existing customers by using aggressive pricing, promotions, and distribution strategies. For example, Papa Tom's Pizza can offer discounted prices or bundle deals to encourage customers to buy more.