Which retail innovation, first implemented in 1916, allowed customers to select their own products without clerk assistance, revolutionizing shopping and establishing the foundation for modern retail?

The way we shop has evolved dramatically over the past century. Before modern supermarkets and department stores, shopping was a completely different experience. One particular innovation revolutionized retail by putting product selection directly in customers' hands, dramatically reducing labor costs while increasing sales volumes. This innovation permanently changed the retail landscape and set the foundation for modern shopping experiences, from physical stores to today's e-commerce. Test your knowledge about this pivotal moment in retail history!

This is a live public trivia poll on AIPolls.Net. Vote and see real-time results.

Piggly Wiggly's self-service grocery store model
Sears Roebuck's mail-order catalog system
Marshall Field's department store credit card
F.W. Woolworth's fixed-price 'five-and-dime' concept