In which decade were price tags first widely introduced in retail stores, replacing the common practice of haggling for prices?

Before the modern shopping experience we know today, retail was a completely different world. Many innovations we take for granted revolutionized how people bought and sold goods. This poll explores one such retail innovation that transformed the shopping experience and established trust between merchants and customers. Test your knowledge about this historical retail breakthrough!

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1870s, when John Wanamaker introduced fixed pricing at his Philadelphia department store
1920s, as a response to the economic boom following World War I
1840s, when F.W. Woolworth pioneered the five-and-dime store concept
1910s, when the first self-service grocery stores emerged in America