Which is a common metric used to measure financial performance?

Return on investment (ROI) is a fundamental metric used to assess the financial performance of an investment or business initiative. It measures the amount of return relative to the investment cost, providing insights into the efficiency and profitability of the investment. By calculating ROI, businesses can evaluate how well their funds are being utilized to generate profit, allowing for comparisons across different investments and helping with decision-making regarding resource allocation.

In contrast, market share growth reflects a company's competitiveness in the market rather than direct financial performance. Customer acquisition cost focuses on the expenses involved in gaining new customers, which, while important, does not give a comprehensive view of overall financial success. The brand loyalty index offers insights into customer retention and satisfaction but is more qualitative than quantitative in assessing financial performance. Thus, ROI stands out as a crucial metric for evaluating the effectiveness of financial efforts in achieving profitability.