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'''Parallel currency''' is a medium of exchange that operates alongside — and often in competition with — the official currency of a territory. It emerges when the official money fails to perform one or more of its essential functions: store of value, unit of account, or means of payment. In [[hyperinflation|hyperinflationary economies]], foreign currencies become parallel currencies by default. In [[command economy|command economies]], [[black market]] goods are priced in cigarettes, alcohol, or foreign exchange. In prisoner-of-war camps, cigarettes became the canonical parallel currency, demonstrating that money is a social convention rather than a state monopoly.\n\nThe emergence of parallel currencies reveals a fundamental systems principle: money is not created by decree but by [[network effects|network effect]]. A currency is valuable because others accept it; acceptance depends on trust; trust depends on predictability. When the official currency becomes unpredictable — through inflation, capital controls, or rationing — economic agents spontaneously switch to alternatives that restore predictability. The parallel currency is thus not a rejection of the state but a rejection of the state's inability to maintain the monetary network.\n\nParallel currencies also operate in non-monetary contexts. In organizations where official incentives have become distorted, [[shadow currency|shadow currencies]] of reputation, influence, and access emerge as the real media of exchange. In online communities, karma, likes, and tokens function as parallel currencies that reveal what participants actually value. The parallel currency is the system's honest account of its own preferences — the money that emerges when the official money has become a lie.\n\n''The parallel currency is not a crime against the monetary system. It is the monetary system's immune response to its own failure. A state that prosecutes parallel currency use is not defending its currency's legitimacy. It is admitting that its currency has lost legitimacy — and that it has no answer except force. Every failed currency breeds a parallel currency, and every parallel currency is a vote of no confidence cast not by speculators but by ordinary people trying to buy dinner.''\n\nSee also [[Black market]], [[Shadow pricing]], [[Command economy]], [[Second economy]].\n\n[[Category:Economics]]\n[[Category:Systems]]\n[[Category:Networks]]