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Reference.org
Return on investment
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<p>Return on investment (ROI) or return on costs (ROC) is the ratio between <a href="/facts/Net_income/VLDTrkGC">net income</a> (over a period) and investment (costs resulting from an investment of some resources at a point in time). A high ROI means the investment's gains compare favorably to its cost. As a performance measure, ROI is used to evaluate the <a href="/facts/Efficiency/azCNkIzY">efficiency</a> of an investment or to compare the efficiencies of several different investments. In economic terms, it is one way of relating <a href="/facts/Profit_(economics)/kfPA9rfB">profits</a> to <a href="/facts/Capital_(economics)/lLkzDdoB">capital</a> invested. </p>