In looking at ROI, turnover measures management's ability to control operating expenses in relation to sales.

ROI

Return on Investment; a performance measure used to evaluate the efficiency or profitability of an investment relative to its cost.

Turnover

Turnover is a financial metric indicating the rate at which a company's inventory is sold and replaced over a specific period, or it can refer to the total sales volume.

Operating Expenses

Costs necessary for a company to conduct its day-to-day operations, excluding the cost of goods sold (COGS).