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Why the strategies of Google, USAA and Vanguard have been so effective

What other firms refuse to learn from Costco

Why aren't the benefits of better compensation common knowledge among business owners? 

Harvard Business Review: Inequality isn't just due to market forces, 2017-Mar-30 by Adam Cobb

For example, Costco has long been recognized as a “high road” employer that pays above market wages, offers good benefits, and provides workers opportunities for advancement. Despite these significant labor investments, from 2007 to the end of 2016, Costco’s stock price increased over 200%, far outpacing the overall growth of the S&P 500 (58%) and that of competitors like Walmart (45%) and Target (26%), which is known to pay workers low wages and offer relatively meager employee benefits. Of course, this is just one example, and there are a number of reasons why these firms’ performance varied during this period. But research shows that firms that pay workers higher wages, provide better benefits, and offer predictable working hours attract workers who are more productive and more committed to their employers. And improved worker productivity and lower turnover frequently more than offsets these firms’ higher labor rates.