Looking forward, investors can protect themselves against inflation in the US by buying Treasury Inflation-Protected Securities (TIPS), which index interest and principal payments to offset the rise in the consumer price level. The current small difference between the real interest rate on such bonds (2.1% for 30-year bonds) and the nominal interest rate on conventional 30-year Treasury bonds (now 4.6%) implies that the market expects only about 2.5% inflation over the next three decades.