Which ancient cultural marketplace tradition directly inspired the modern retail practice of 'loss leaders' where stores sell certain items below cost to attract customers?

In many cultures around the world, traditional marketplaces and bazaars established retail practices that continue to influence modern commerce. From ancient trade routes to modern shopping experiences, cultural traditions have shaped how products are presented, negotiated, and sold. This trivia question explores how a specific cultural tradition influenced a now-common retail practice that many consumers encounter daily.

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The Japanese 'Omotenashi' tradition of exceptional hospitality with complimentary tea
The Middle Eastern bazaar practice of 'Taʿāruf' where merchants offer free samples to entice customers
The Nordic 'Jante Law' principle of maintaining pricing equality within communities
The West African market tradition of 'Dash' where additional items are gifted after purchase