In times like these, investors may want to look to billionaire investor Warren Buffett for guidance. Buffett is a value investor, and so it should come as little surprise to investors that what he likes to focus on is price and valuation.

Warren Buffett and his crew at Berkshire Hathaway (NYSE: BRK.A) (NYSE: BRK.B) have one of the best investment track records of all time. Few investors have been able to match Buffett's success over Berkshire's long history.

Fifty-eight-year-old Margo has amassed a very healthy retirement fund, in part by buying shares in Berkshire Hathaway, the investment company run by Warren Buffett. When even the ‘Sage of Omaha’ is reducing his exposure to certain US stocks, Margo wonders if it’s time for her to follow his lead and look to invest in other parts of the world.