Treasury bonds and related exchange traded funds have been on a tear as the yield on benchmark 10-year Treasury note dropped to its lowest level ever Wednesday.

Year-to-date, the iShares 7-10 Year Treasury Bond ETF (NYSEArca: IEF) rose 8.6% and iShares 20+ Year Treasury Bond ETF (NYSEArca: TLT) gained 19.4%. Both funds are trading near their all-time highs.

Related: Treasury ETFs Climb as Yields Hit Record Lows

The Treasury market has strengthened, with yields on benchmark 10-year notes hovering around 1.38% after trading as low as 1.321% Wednesday. Bond prices and yields have an inverse relationship, so falling yields correspond with rising prices.

Now, fixed-income observers are eyeing the 1% mark as further volatility could potentially push yields even lower and help support an extended bond rally.

“If the global and U.S. [economies are]pulled down by Brexit, then yields have room to fall, and potentially we could see 10-year U.S. yields below 1%,” Jae Yoon, chief investment officer at New York Life Investment Management, told the Wall Street Journal.


Alternatively, Yoon believes yield could climb back above 2% if the United Kingdom and the European Union make “an amicable divorce,” work out trade issues and assuage market fears.

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