Which ancient civilization first implemented a documented subscription-based model where citizens could pay in advance for regular deliveries of grain and olive oil?

While subscription services seem modern, ancient civilizations pioneered recurring payment models for various goods and services. These early 'subscription' systems revealed sophisticated economic thinking and customer retention strategies that parallel our modern approaches. This poll tests your knowledge about one of history's earliest documented subscription models and how ancient merchants maintained customer loyalty across civilizations.

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Ancient Egypt, where citizens could subscribe to regular grain deliveries using a papyrus-based receipt system during the New Kingdom period (1550-1070 BCE)
Mesopotamia, where clay tablets from Babylon documented monthly oil and grain subscriptions payable in silver shekels (circa 1800 BCE)
Ancient Rome, where the 'annona' system allowed citizens to pre-pay for quarterly grain allocations with bronze tokens (circa 120 CE)
Ancient Greece, where merchants in Athens offered olive oil subscriptions recorded on stone tablets with quarterly delivery schedules (circa 500 BCE)