Which ancient retail practice was known as 'The Silent Trade' and involved merchants exchanging goods without direct contact or common language?

Cultural traditions have shaped retail practices across different civilizations throughout history. From ancient market bazaars to modern cultural shopping districts, retail history reflects how communities preserve and share their heritage through commerce. This poll tests your knowledge about a significant historical retail practice that influenced cultural preservation and exchange. How well do you know the intersection of cultural traditions and retail history?

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Barter silentium - Roman merchants would leave goods at temple entrances for 'silent' divine blessing of transactions
Silent barter/dumb trade - Merchants would leave goods in a neutral location, retreat, and the other party would leave their offer in exchange
Whisper markets - Mediterranean traders conducted business through whispered negotiations to prevent competitors from overhearing prices
Moon exchanges - East Asian night markets where merchants traded exclusively using hand signals under moonlight to preserve cultural secrecy