Which revolutionary pricing strategy, first widely implemented in the 1870s, transformed retail by eliminating haggling and introducing standardized prices clearly marked on merchandise?

In the evolution of retail history, pricing strategies have undergone remarkable transformations that shaped how we shop today. From traditional haggling in ancient marketplaces to sophisticated algorithmic pricing in the digital age, the innovation of certain pricing methods revolutionized retail forever. This trivia question explores a pivotal moment in retail pricing history that fundamentally changed the consumer shopping experience and retail business models worldwide.

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One-price policy (fixed pricing)
Loss leader pricing
Psychological pricing (charm pricing)
Subscription-based pricing