Indeed, while buying at the right price may ultimately determine the profit gained, selling at the right price guarantees the actual profit, if any.

尽管在正确的价位买入股票的确会最终决定赚得的利润，但是，如果有获利的话，在正确的价位卖出股票可以确保获得实际利润。

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This index is higher, investor can gain actual profit taller, and the real income that turns yield and investor nearly 7 days years, still put in the distance with certain move.

这个指标越高，投资人可获得真实收益就越高，而近7日年化收益率与投资者的真正收益，仍存在着一定的距离。

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They sell in part to speculators who hope to profit from any difference between the prices in futures markets and actual future prices.

他们将一部分出售给投机家，而投机家也希望从期货市场价格和将来实际价格之间的任何差异中获利。

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If an aide bought the stock below that daily high or sold it above that daily low, the actual profit would have been bigger than the Journal calculation.

WSJ: Congressional Staffers Gain From Trading in Stocks

Concluding, how do these numbers translate into actual telco profit markup on text service, to evaluate market efficiency?

FORBES: Insane Calculation: It Costs More To Send A Text Next Door Than To Mars

You could argue that getting users into the iOS ecosystem is worth the possibility of damaging profit margins, even the actual level of profits, in the short term in order to benefit in later years as people trade up.

FORBES: Is Apple's Cheaper iPhone Coming At $100 A Piece?