(Bloomberg) -- Mohamed El-Erian said he's favoring cash when managing his own money. The idea is catching on in the bond market as benchmark 10-year U.S. yields rise to the highest level since May.

Mirae Asset Global Investments said it is building its cash position in one of its Asia bond funds during the U.S. presidential campaign. Fukoku Mutual Life Insurance says it hasn't been able to find value in the biggest bond markets. A survey of investors by Bank of America showed cash holdings match the highest levels since the terror attack on the U.S. on Sept. 11, 2001.

Bonds are falling around much of the world as investors reconsider how much longer central banks in advanced economies will maintain their monetary-stimulus programs. The Federal Reserve is considering raising interest rates, and Americans vote in the presidential election Nov. 8.

"I'm increasing my cash position now," said Enna Li, who manages a bond portfolio in Taipei for Mirae Asset, which oversees $93 billion globally. "The U.S. election is a big uncertainty." Li said she holds 10% in cash, versus the usual allocation of 3% to 5%.

The benchmark Treasury 10-year note's yield was little changed at 1.87%, based on Bloomberg Bond Trader data. The price of the 1.5% security due in August 2026 was 96 23/32. The yield touched 1.88%, a level not seen since May.

Treasuries remained lower after a report Friday showed U.S. gross domestic product accelerated last quarter at a faster pace than economists projected.

Bonds worldwide have lost 2.9% in October, according to the Bloomberg Barclays Global Aggregate Index, on course for their worst month since May 2013.

Global fund managers had 5.8% in cash, Bank of America said in its survey published this month. Besides reaching that level in 2001, the allocation also climbed that high in July following the U.K. vote to leave the European Union.

El-Erian, the chief economic adviser at Allianz SE, said last week he holds 30% of his own money in cash.

Central banks in the U.S., Japan and Europe have used unprecedented asset purchases to support their economies. Now futures contracts imply there's about a 73% chance the Fed will raise interest rates by December. 

The Bank of Japan shifted to targeting bond levels from its goal to push yields lower. European Central Bank officials who asked not to be identified said the authority will probably gradually wind down its bond purchases, though the ECB later said the governing council hadn't discussed it.

Fukoku Mutual spent most of 2016 building its cash holdings because low yields in the biggest bond markets are unattractive, said Yoshiyuki Suzuki, the head of fixed income in Tokyo, who helps manage the firm's $61 billion in assets. Ten-year debt yields 0.18% in Germany and minus 0.06% in Japan. Suzuki said he invested funds his firm earned on gains in the currency market in U.S. government bonds from July through September.

"The cash position is larger than usual," Suzuki said. "We can't find a good market. In that case, cash holding is a good strategy." Cash holdings at the insurer climbed to 6.6% of assets as of June 30 from 4.9% at the end of March, based on data on the company's website.

Now's the time to "get out of the way" in the debt market, Kathleen Gaffney, a bond manager at Eaton Vance in Boston, said on Bloomberg Television last week. The $37 million Eaton Vance Core Plus Bond Fund, which Gaffney helps run, had 30% of its assets in cash at the end of September, according to the company's website. The figure jumped from 23% at the close of August, based on data compiled by Bloomberg.

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