The Daily Money 12-19

Happy Thursday, Money readers. It's David, with our must-read financial news of the day.

An impeached president, a lingering trade war and a bull market that keeps getting older. If you're anxious about where stocks are headed next year, here's advice for managing your 401(k) investments. Speaking of money, are we getting closer to becoming a cashless society? And the most helpful business books may not be business books. 

David Brinkerhoff, Deputy Money Editor