Dollar General is dominating in America. Here's how it keeps its prices so low. (DG)

Dollar GeneralDollar General is opening 975 stores in 2019. AP

Dollar General is taking over the United States.

This no-frills, bargain-hunters’ paradise is growing at a level that is largely “unthinkable” in retail, Credit Suisse analysts wrote in June.

In 2017, Dollar General opened new locations at a rate of around four stores a day. In 2018, it opened 900 stores, and in 2019, it plans to open 975 more.

While competitors have been squeezed by growing competition online and from Amazon, Dollar General and the dollar-store sector, in general, have flourished, swooping in and offering customers prices that are 20% to 40% lower than grocery and drug stores. Earlier this month, it continued its 29-year long sales growth streak, reporting a 4% increase in same-store sales during the fourth quarter of 2018.

Since it opened its first store in a small town in Kentucky in 1955, Dollar General has stayed true to its roots, predominantly serving rural and suburban low-income customers. The retailer’s target shopper comes from a household making $40,000 or less a year and is often living in areas called “food deserts,” meaning they are miles away from access to grocery stores.

Here’s how Dollar General keeps its prices low: