
Historically investors have had to protect themselves against rising inflation by demanding higher yields. There is a nasty lesson every bond market neophyte learns quickly and painfully: higher yields mean lower prices. In the 1970s, bonds were called "Certificates of Confiscation," because their losses were so great. The bonds' principal kept losing value in real terms as inflation eroded their purchasing power. Then prices fell each time inflation accelerated. Investors marked them down to keep yields up with inflation.