Economic expansions don't have a predetermined shelf life. They don't come with expiration dates or time limits. They don't die of old age. Australia hasn't experienced a recession — defined as two or more consecutive quarters of negative growth — since 1991. So the mere fact that the current U.S. expansion is the longest on record shouldn't necessarily be concerning.

Treasury Secretary Steve Mnuchin recently criticized 181 CEOs of leading corporations, including Apple, Amazon and Walmart, who signed a statement redefining the purpose of a corporation.

Retirement experts frequently recommend working longer if you haven't saved enough. But you may not realize just how powerful a little extra work can be. Researchers who compared the relative returns of working longer versus saving more last year reached some startling findings.