A flow variable represents the change per unit of time, like the flow of water in a river or the flow of revenue and expenses into and out of a firm.

流动可变性是指每单位时间内的改变，例如河中水的流动或者公司收入和支出的资本流动。

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The letter "C" in the first equation refer to "Contribution". It means the differenCe between sales revenue and variable Costs.

第一个等式中的“C”是指边际贡献，它是指销售收入和变动成本之间的差额。

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The firm shuts down if the revenue it gets from producing is less than the variable cost of production.

如果从生产中获得的收益小于生产的可变成本，企业就会停止营业。

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The increase in fulfillment centers can be viewed as an investment in future growth and perhaps margins assuming better efficiencies, but an increase in variable costs per revenue can signal permanently declining margins.

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Two days ago, Forbes first reported that Morgan Stanley had been served earlier with a subpoena by Massachusetts Secretary of the Commonwealth William Galvin seeking details of its variable annuity sales, including revenue-sharing arrangements, compensation, whether the products receive preferred sales treatment, commission schedules, prospectuses and documents for internal use only (see: " Morgan Stanley Subpoenaed Over Annuity Sales").

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Looking at the variation in the cheapest tickets offered across games shows that variable pricing is a more efficient method of revenue management and maximization.

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