“The Fed has finally broken that cycle by beginning policy normalization, and hopefully this will provide the market some clarification and resolve in a more solid direction,” Arone said by phone. “If the market feels comfortable at the pace of which the Fed moves interest rates and the economy is recovering, risk assets like stocks could perform well.”

The S&P 500 has made little headway in 2015, adding 0.1 percent without dividends. Equities fared worse in dollar terms outside the U.S., with the MSCI EAFE Index dropping 3.1 percent while the MSCI Emerging Markets Index sinking 16 percent.

Commodities have fallen to a decade low as tepid global inflation dimmed the allure of precious metals, weak Chinese demand hurt raw-materials prices and a global supply glut sent crude oil tumbling. In the bond market, high-yield corporate debt is heading for first annual decline since 2008 amid a flood of investor redemptions from junk bond funds and concern rising borrowing costs will threaten corporate solvency.

According to Bianco’s study, gains from the best-performing assets had surpassed 10 percent in all but one year since 1995. During the last nine decades, 23 years, or a quarter of the total, saw at least one asset class returning more than 30 percent, and only four ended with gains smaller than 4 percent.

“Investor expectations for both equities and bonds have been elevated by recent history,” Lowell Yura, head of multi- asset solutions for BMO Global Asset Management in Chicago, said by phone. The firms oversees $225 billion. “This year is a wake- up call to think about lower returns for the next several years.”

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