Dollar stores generally have much higher margins than Walmart or Costco. They're more expensive per unit, but the upfront cash required by the customer is lower

Dollar stores generally have much higher margins than Walmart or Costco. They're more expensive per unit, but the upfront cash required by the customer is lower. For this reason (cashflow) they are seen as a good option for poor people, where in reality everyone would be better served by Costco if they had the cash and storage room to buy in bulk, and a car.