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Return on investment (ROI) is defined as a measure of the profitability of an investment calculated as a percentage. This metric is crucial in finance and investment analysis as it provides a straightforward way to evaluate the efficiency and effectiveness of an investment relative to its cost. ROI is calculated by taking the net profit from the investment, dividing it by the initial cost of the investment, and then multiplying by 100 to express it as a percentage.

For example, if an investment generates a net profit of $1,000 on an initial investment of $5,000, the ROI would be calculated as ($1,000/$5,000) x 100, resulting in a 20% return. This enables investors to compare the profitability of different investments and helps them make informed decisions about where to allocate their resources.

In contrast, other options do not accurately define ROI. A measure of the total revenue generated by an investment focuses solely on gross income without accounting for costs, thus not reflecting true profitability. A technique for analyzing market trends and consumer behavior pertains more to market research rather than investment assessment. Lastly, a comparative assessment of different investment opportunities might suggest evaluating various investments but does not specifically articulate the profitability calculation that defines ROI.