Good companies attract investors. They do so by selling a desirable product that sustains the company’s growth of sales and earnings. The growth of sales is a good measure of market success. Durable companies convert their sales invoices into cash and use the cash wisely. Accounting items such as the free cash flow, sustainable growth rate, quick ratio, and debt-to-equity ratio are easy measures of the company’s health and durability. Growth stocks should be assessed by the quality of the company.