You don't even have to beat the market. Simply trusting your spare cash to an index fund with entirely average long-term returns is more than enough to double your money in 10 years. If you also reinvest dividend in more shares along the way,

It's often helpful to take a look at earnings before interest and tax (EBIT) margins, as well as revenue growth, to get another take on the quality of the company's growth. Costco Wholesale maintained stable EBIT margins over the last year, all while growing revenue 5.4% to US$259b. That's progress.

Costco Teamsters union members voted in favor of authorizing a strike starting February 1 pending contract negotiations. Here's what to know.

Costco (NASDAQ: COST) boasts a membership renewal rate of over 90%. Start Your Mornings Smarter! Wake up with Breakfast news in your inbox every market day. Sign Up For Free » *Stock prices used were the afternoon prices of Jan.