The first and most recent development is the steepening of the U. S. Treasury yield curve and the rise of intermediate and long-term bond yields.

第一种方法，同时也是最近发展趋势，是让美国国债的收益率曲线变陡，提高中期以及长期债券的收益率。

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Vanguard Long-Term Government Bond ETF ( VGLT) seeks to provide a diversified exposure to the long-term U.S. government bond market.

FORBES: Uncertainty Leads Bond ETFs Higher

The Federal Reserve completed its daily purchase of U.S. long-term Treasury bonds Monday, sending Treasury bond prices up and yields down from the morning's levels.

FORBES: Magazine Article

The average yield of the U.S. long-term (20-30 year) government bond was 3.46% in September 1929 and declined steadily to 2.01% in December 1940.

FORBES: Keynesian "Easy Money" Is Nothing But Currency Devaluation