“The idea behind margin trading is simple. If you have an account at a traditional Bitcoin exchange like BitStamp of MtGox, you have two balances: a BTC balance and a USD balance. Apart from depositing and withdrawing, the only operation available to you is trading one currency for another. If you are participating in the exchange as a trader, your goal is to convert to BTC before the exchange rate goes up, and convert to USD before the exchange rate goes down, slowly increasing the net worth of your account over time. Margin trading services add only one feature to this model: the ability to have one of your balances go negative.”
http://bitcoinmagazine.com/bitfinex-bitcoinica-rises-from-the-grave/
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