Method Deduce economical recoverable reserve of heavy oil reservoir under thermal production with the principle of investment vs. returns.

方法利用投入产出原理，推导出热采稠油油藏的经济可采储量的计算方法。

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Then after four main investment & financing modes were analyzed in detail, the evolution law and selection principle of the urban rail transit investment & financing modes were concluded in the paper.

在系统分析轨道交通四种主要投融资模式类型基础上，总结了城市轨道交通投融资模式演变规律及选择原则；

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The state is now the principle driver of investment value.

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Federal securities laws have long been driven by the principle that investment decisions should be based on the disclosure of information necessary to understand the elements of real and unreal values behind a given security.

FORBES: Oil and Gas Payment Disclosure May Harm Investors

When it comes to investment strategy, the mantra of buy and hold has been a prevailing principle of success for decades.

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