- Someone holds bitcoins, but they cannot tolerate the volitility of the exchange rate between bitcoin and the local currency that they need for most daily expenses. They prefer the stability of a currency that slowly, but consistently loses value over time. They exchange bitcoin for their preferred currency.
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I would rather not speculate and take a more predictable path.
- Someone holds bitcoins, and they have a need to spend non-bitcoin currency. They don't have enough of that currency on hand to make the necessary payment. They exchange bitcoin for the needed currency to fund the payment.
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who have to trade in their Bitcoins as soon as they get them.
- Someone sees the volatility of the bitcoin exchange rate as an opportunity to gamble on the short term changes. They buy and sell bitcoin as a way to place bets on the direction the exchange rate will move next.