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The triple bottom line approach to investment decisions is also referred to as the “three Ps” of investing, that is, “profit”, “people”, and “planet”. This method includes consideration of economic, environmental, and societal effects of any investment decision and is a fundamental element used in determining the sustainability of an investment. A challenge of this method is that it is difficult to develop an overall project score because the “people” and “planet” elements are difficult to quantify in terms of dollars.