Mr Huang realized that the other part of the profit equation is revenue.

黄先生认识到收入是利润等式的另一个参数。

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The second equation tells us that the difference between contribution and fixed costs is profit or loss.

第二个等式告诉我们， 边际贡献和固定成本之间的差额就是利润或亏损。

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The former is called the graded mine rent and the latter absolute mine rent and they are the excess profit obtained by the equation of existing income value.

前者就是级差矿租和绝对矿租（统称为矿租或矿山地租） ，是通过收益现值法公式计算出来的超额利润。

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They use a simple profit equation to decide if they want to invest in your company or not.

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And that forces you to look at both sides of the profit equation, working on the revenue side and working on the cost side.

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The profit equation tends to hold for sequels, too.

FORBES: Magazine Article