Gasoline prices are on the rise again. Inflation is too (thanks, in part, to rising gas prices). The Federal Reserve hasn't ruled out additional interest rate increases over the next several months. And the stock market's nice surge so far this year seems to have stalled out.

What should investors do?

Billionaire Ray Dalio offered his answer in response to the question last Thursday at the Milken Institute Asia Summit in Singapore. The successful hedge fund manager recommended four things for investors to do in today's volatile market -- and one thing to absolutely avoid.

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Source Fool.com