Just take a look at "While Wall St. Talks of Recession, Bond Investors Make a Killing" (https://www.nytimes.com/2019/08/28/business/bond-market-trade-war.html h

Just take a look at "While Wall St. Talks of Recession, Bond Investors Make a Killing" (https://www.nytimes.com/2019/08/28/business/bond-market-trade-war.html https://www.nytimes.com/2019/08/28/business/bond-market-trad...) for an idea of how smart it would have been to buy 30 year and other long term bonds. An alternative interpretation of the yield curve is that long term bonds were wildly underpriced, and for some reason still are!