CLEANUP ON AISLE 12
Customers can buy quinoa at Trader Joe's for half the price they would pay at Whole Foods Market. Customers are promised up to 50 percent savings by buying daily necessities at Aldi. More than 90 percent of Costco members renew their memberships, because the savings are worth it. But how? Here's a look at the strategies the most popular discount grocery stores use to keep costs low, passing on the savings to customers in the form of lower prices.