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Return on investment (ROI) is the benefit to the investor resulting from an investment of some resource. A high ROI means the investment gains compare favorably to investment cost. As a performance measure, ROI is used to evaluate the efficiency of an investment or to compare the efficiency of a number of different investments.〔"(Return On Investment – ROI )", Investopedia as accessed 8 January 2013〕 In purely economic terms, it is one way of considering profits in relation to capital invested. == Purpose == In business, the purpose of the "return on investment" (ROI) metric is to measure, per period, rates of return on money invested in an economic entity in order to decide whether or not to undertake an investment. It is also used as indicator to compare different project investments within a project portfolio. The project with best ROI is prioritized. Recently, the concept has also be applied to scientific funding agencies (e.g. National Science Foundation) investments in research of open source hardware and subsequent returns for direct digital replication.〔 Joshua M. Pearce. (2015) (Return on Investment for Open Source Hardware Development ). ''Science and Public Policy''. DOI :10.1093/scipol/scv034 (open access )〕 ROI and related metrics provide a snapshot of profitability, adjusted for the size of the investment assets tied up in the enterprise. ROI is often compared to expected (or required) rates of return on money invested. ROI is not net present value-adjusted and most school books describe it with a "Year 0" investment and two to three years income. Marketing decisions have obvious potential connection to the numerator of ROI (profits), but these same decisions often influence assets usage and capital requirements (for example, receivables and inventories). Marketers should understand the position of their company and the returns expected.〔 In a survey of nearly 200 senior marketing managers, 77 percent responded that they found the "return on investment" metric very useful.〔 Return on investment may be calculated in terms other than financial gain. For example, social return on investment (SROI) is a principles-based method for measuring extra-financial value (i.e., environmental and social value not currently reflected in conventional financial accounts) relative to resources invested. It can be used by any entity to evaluate impact on stakeholders, identify ways to improve performance, and enhance the performance of investments. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Return on investment」の詳細全文を読む スポンサード リンク
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