What insight does ROI give into investment performance? Is it acceptable to lose profit on one product, if that product is vital to the sale of an extremely profitable product? Why?

Return on investment (ROI) can be defined as a performance measure used to evaluate the efficiency of an investment or to compare the efficiency of a number of investments.

The ability to calculate return on investment is particularly valuable for any business regardless of its size or industry. by calculating ROI, an individual can understand how well their business is doing and which areas needs improvement.

Every business decision requires knowldge of ROI, so as to optimize profitability. Yes it is acceptable to loose profit of one product for the sale of a profitable product because the gain that would be derived by selling an extremely profitable products is better for the company that the gain one product will derive. Afterall, every company wants to increase profitability.