You'll earn 6% back at U.S. supermarkets on up to $6,000 a year in spending, plus 6% back on select U.S. streaming services and 3% back at U.S. gas stations and eligible transit. Terms apply.

Investors will often calculate sales per week and sales per square foot when evaluating supermarkets. Fledgling food and beverage manufacturers will often allow supermarkets to place their ...