Final answer:
Free shipping, free freight, and dollar discounts are types of promotional incentives used by online retailers to increase sales and attract customers.
Step-by-step explanation:
Free shipping, free freight, and dollar discounts are examples of promotional incentives.
These incentives are a part of marketing strategies employed by online retailers to attract customers and encourage them to complete a purchase.
Promotional incentives can come in various forms, including special offers, discounts, vouchers, or other deals that provide immediate benefits to buyers, such as reduced costs or added value to their purchase.