Turnover is an important measure of a company’s performance and investment portfolio performance. It indicates the efficiency of the operations of a business, as well as its degree of profitability.

Accounts receivable turnover is one of the most critical measures of a company’s financial health. It indicates how quickly customers are paying off their debts, which has a direct impact on the company's cash flow. A higher turnover rate is good news, as it means customers are paying quicker than expected. A low turnover rate could be a sign that customers are struggling to pay their debts or that the company's credit terms are too lax.

Inventory turnover is also an important calculation, as it measures how quickly a company sells its products. A high inventory turnover is a sign that a company is selling its products efficiently and quickly, which indicates strong demand in the market. A low inventory turnover is a sign of poor sales and slow demand, as well as inefficient inventory management.

In the investment industry, turnover rate indicates the portion of a portfolio that is sold and replaced throughout the year. The higher the rate, the more frequently the portfolio is being sold and replaced. Investment experts use turnover rate as one way to judge the active management of a portfolio, with higher rates indicating more short-term buying and selling decisions.

In conclusion, turnover is a useful measure to understand how quickly a company is managing its operations, utilizing its credit terms, selling its products, and actively managing its investment portfolio. It is an important indicator of both the financial health of a business and the efficiency of its operations.