In addition to subscriptions, the revenue model includes referral fees, transaction fees, consumption-based pricing, performance-based pricing, reseller margin, and revenue sharing.

除订阅外，收入来源还有介绍费、交易费、基于消费的定价、基于性能的定价、转销收益及收入分成。

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Positions open and maintain the required margin is the margin of each half of the original transaction.

开设与维持头寸所需的保证金是每笔交易的正常保证金比例。

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Under this situation, the exchange markets all increase the margin deposits or cancel the discounts for unilateral transaction fees to prevent speculations.

面对这一局面，交易所纷纷提高交易保证金，或是取消单边交易手续费的优惠来防止投机。

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Speculators prefer their gold in the form of exchange-traded funds such as SPDR Gold Shares (GLD) and iShares Gold Trust (IAU) rather than in bullion because of their low transaction costs, liquidity and the ability to margin their holdings.

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The caveats: transaction costs can add up, and trading on margin, as most people do, is risky.

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As an investor who likes the Facebook story, I would prefer Facebook to post another quarter in order to reverse its margin compression and to prove its ability to leverage the Instagram transaction into a revenue-generating mobile strategy.

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