Don't cut and run this year: BlackRock

The world's largest asset manager, BlackRock, advised clients Monday to "resist the urge to exit" as stock market fluctuations increase in 2015.

"Higher volatility in 2015 might tempt some investors to head for the exits," global chief investment strategist Russ Koesterich wrote in the firm's 2015 outlook note. "But avoiding the markets can cost you over time."

Despite a rockier ride, BlackRock predicted stocks to beat bonds and cash for another year. The firm also said long-term interest rates would stay low, inflation would stay at bay and the dollar would continue higher this year.