Which pricing strategy discovery, first widely implemented in the 1880s, created a psychological perception of better value and is credited with transforming modern retail pricing practices?

In the world of retail and product marketing, innovations in pricing strategies have transformed how consumers shop and how businesses compete. Some discoveries in pricing psychology have changed the retail landscape forever. This trivia question explores one of the most influential pricing strategies that revolutionized consumer perception and behavior. Can you identify which groundbreaking pricing approach created a psychological shift that retailers worldwide have adopted?

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Charm pricing (pricing items at $0.99 instead of $1.00)
Bundle pricing (offering products together at a discount)
Dynamic pricing (adjusting prices based on demand in real-time)
Loss leader pricing (selling items below cost to attract customers)