The S&P 500 rose by almost 2% today, closing at 1395.95, the highest level since June 2008, driven by an increase of 6 basis points in the breakeven TIPS spread on 10-year Treasuries, the spread rising to 2.34%. According to the Cleveland Federal Reserve Bank, which has developed a sophisticated method of extracting the implicit inflation expectations from the relationship between conventional Treasuries and TIPS, the breakeven TIPS spread overstates the expected inflation rate, so even at a 10-year time horizon, the market expectation of inflation is still well under 2%. The yield on 10-year Treasuries rose by 10 basis points, suggesting an increase of 4 basis points in the real 10-year interest rate.
Since the beginning of 2012, the S&P 500 has risen by almost 10%, while expected inflation, as measured by the TIPS spread on 10-year Treasuries, has risen by 33 basis points. The increase in inflation expectations was at first associated with falling real rates, the implied real rate on 10-year TIPS falling from -0.04% on January 3 to -0.32% on February 27. Real rates seem to have begun recovering slightly, rising to -0.20% today, suggesting that profit expectations are improving. The rise in real interest rates provides further evidence that the way to get out of the abnormally low interest-rate environment in which we have been stuck for over three years is through increased inflation expectations. Under current abnormal conditions, expectations of increasing prices and increasing demand would be self-fulfilling, causing both nominal and real interest rates to rise along with asset values. As I showed in this paper, there is no theoretical basis for a close empirical correlation between inflation expectations and stock prices under normal conditions. The empirical relationship emerged only in the spring of 2008 when the economy was already starting the downturn that culminated in the financial panic of September and October 2008. That the powerful relationship between inflation expectations and stock prices remains so strikingly evident suggests that further increases in expected inflation would help, not hurt, the economy. Don’t stop now.