1. How Did Shopping for Groceries Work Before Shoppers Could Pick Things Themselves?
Many American grocery stores in the early 1900s worked like a restaurant with no menu on the table. Customers told a clerk what they wanted, and the clerk collected it. Some stores also delivered the bags to your home. A 1980 news story describing the Memphis museum exhibit about this period put it simply: before the first self-service store, groceries were ordered and delivered by grocers and clerks, and customers seldom touched the goods until they were bagged and carried into their own kitchens [1].
That system had good points, such as friendly help and heavy bags carried for you. But every customer needed a clerk's attention, so a busy store needed many clerks, and shoppers could not wander along a shelf comparing products [1].
2. What Was Different About the Piggly Wiggly Store That Opened in Memphis in 1916?
In September 1916, a Memphis, Tennessee grocer named Clarence Saunders opened a store called Piggly Wiggly. It is widely described as the first self-service grocery store in the United States, but that "first" comes mostly from the company itself, which calls its shop "America's first self-service grocery store" [2]. It is safest to say it is the first one we know of that became famous.
The idea was to hand over some of the clerk's work to the customer. According to the 1980 news story, Saunders built the store on two ideas: people wanted to save money, and people wanted to see what they were buying. His slogan for the change was "no credit, no delivery, no clerk to do what customers should do for themselves" [1]. Fewer clerks, he argued, meant lower prices.
The store's layout did the clerk's guiding job instead. A Tennessee state history site for kids notes that Piggly Wiggly stores had one-way aisles to keep traffic orderly, and that each store was laid out the same way, with each product in the same place [3]. Wikipedia's article on Saunders adds that the Memphis store had turnstiles at the entrance and exit, shopping baskets, and one cashier stand at the end of the path with a cash register [4]. That one source alone supports those details, so treat them as a good description rather than a proven record.
3. How Did a Single Memphis Store Turn Into a Chain Across the Country?
Saunders did not open every store himself. His company let other grocers open Piggly Wiggly stores that followed his plan, using what is called a franchise. The company's own history says it received a patent on the self-service format and issued franchises to hundreds of grocers, whose stores had to follow his strict rules and sell for cash only [2]. By 1922, the Tennessee site says, there were about 1,200 Piggly Wiggly stores, by far the largest grocery chain in the country at that time [3]. Wikipedia gives similar numbers: 615 stores in 1921 and 1,267 in 1923 [4].
Notice what these sources do not say. They show that the idea grew fast, but none of them proves exactly why other stores copied it. One possible explanation is that the idea matched what Saunders promised: shoppers could see what they bought, and stores might need fewer clerks. That is a guess, not a measured result. The sources also add that Saunders later lost control of his company [3], so the story of the idea and the story of the man are not the same.
4. Is a Self-Service Store the Same Thing as a Supermarket?
No, and mixing them up is common. Self-service is a way of shopping: you pick the goods and pay at the end. A supermarket is a kind of store: large, with many kinds of goods, low prices, and often plenty of parking.
The store that Wikipedia says is widely considered the first American supermarket is King Kullen, opened by Michael Cullen on August 4, 1930, in a leased empty garage in Queens, New York. It sold about 1,000 different items, advertised low prices, and offered free parking for people arriving by car [5]. That is fourteen years after Piggly Wiggly. The same article says the Smithsonian Institution recognizes Cullen as the inventor of the modern supermarket, while listing Piggly Wiggly as having pioneered self-service in 1916 [5]. That article is flagged for needing better citations, so the claims should be checked against stronger sources before anyone treats them as settled.
So two different inventions are easy to mistake for one. Letting customers choose their goods came first, in 1916. Putting that idea inside a big, cheap, car-friendly warehouse of food came later, in 1930.
5. Did the Same Idea Reach Other Countries, Such as Japan?
Yes. In Japan, supermarkets are often called スーパー (sūpā), short for "supermarket" [6]. The English-language site Nippon.com says that Japan's first Western-style self-service supermarket opened in 1953, and that the idea caught on quickly because such stores offered a wide choice of reasonably priced food in one place [6]. As of September 2014, Japan had 20,404 supermarkets, and in 18,550 of them food made up more than 70 percent of sales [6]. Those are 2014 numbers, not today's.
The same page notes some differences in daily habits. Cashiers in Japan usually do not bag the groceries; shoppers pack their own bags at a separate counter [6]. The way people shop depends on the country, even when the basic idea is shared. This article did not look into exactly why self-service spread so quickly in Japan, so that question is still open.
6. How Can You Spot the 1916 Ideas in a Store Near You?
Next time you visit a grocery store with an adult, walk in as a detective. Where are the baskets and carts? Do the aisles seem to lead you in a path? Where do you pay: all in one place, or spread around? Then find the places where a person still hands you the food, such as a deli or fish counter. Why do you think those counters have kept the clerk?
If you want to dig deeper, try asking an older relative how they remember shopping when they were young. You could also read the original sources below and decide whether you agree with how this article put the pieces together.