In pursuit of the relative competitive advantage, people began to find new theories and research methods, and then the theory of customer perceived value is produced.

为了追求相对的竞争优势，人们开始致力于寻找新的理论和研究方法，顾客感知价值理论就是在这样的背景下产生的。

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Neither came up with any spectacular new investments or produced anything of tangible value, which leads to the question: When it comes to pay, is there something unique about the financial industry?

NEWYORKER: What Good Is Wall Street?

What is the value of the goods and services produced by the new government stimulus spending?

FORBES: Can We Spend Ourselves From Recession To Prosperity?