ECONOMISTS develop economic models to explain consistently recurring relationships. Their models link one or more economic variables to other economic variables (see “What Are Economic Models,” F&D, ...

CONSUMPTION, production, and investment decisions of individuals, households, and firms often affect people not directly involved in the transactions. Sometimes these indirect effects are tiny. But ...

Investing in stocks means putting your money to work in publicly traded companies. By buying a stock, you get a slice of ownership and a share of its future profits. According to The Motley Fool's ...

ETFs can help eliminate risk because they tend to be less volatile than individual stocks and give exposure to a range of assets. An ETF allows investors to purchase a diversified portfolio of stocks ...

Any one or more of these errors may exist in a program, and each will cause the program to crash or not run at all.