The smart money sees powerful economic forces, which transcend the power of the Fed, pushing interest rates downward. By Jeremy J. Siegel, Contributing Columnist From Kiplinger's Personal Finance, June 2014 In the early 1980s, economist Ed Yardeni coined the term “bond vigilantes” to describe fixed-income investors who scrutinize government policies and push bond prices down, and interest rates up, at the first hint that those policies are sending the country on an inflationary course.See Also: Interest Rates and the Real Unemployment Rate During the 1990s, Clinton political adviser James Carville claimed that if he were reincarnated, he’d like to come back as the bond market because of its power to scare other markets and intimidate politicians. At that time, most economists and policymakers conceded that the government had no real control over long-term interest rates because savvy bond traders would always demand rates that took full measure of the inflationary consequences of government actions. Today the pendulum has swung in the opposite direction. Now critics blame the Federal Reserve for artificially propping up the bond market and keeping both short- and long-term interest rates far below the levels appropriate for this stage of an economic recovery. Advertisement Where are the bond vigilantes who are supposed to punish the Fed’s easy-money policies by shunning bond purchases and sending yields skyward? Have they thrown up their hands, conceded that they can’t fight the power of the central bank and fled the market? Downward pressure.The answer is no, the bond vigilantes have not fled the market. The truth is that the smart money sees powerful economic forces, which transcend the power of the central bank, pushing interest rates downward. Though the Fed has the ability to set short-term rates, it has only marginal influence on long-term rates, which are driven largely by economic forces—notably, economic growth, inflation and how investors feel about risk. Today, all those variables are moving in a direction that keeps interest rates low. For starters, the Congressional Budget Office predicts that growth in real potential gross domestic product will slow to about 2% per year over the next decade as a result of the slowdown in the growth of the labor force. That estimate is about 1.5 percentage points lower than the average annual real GDP growth that we experienced in the post–World War II period prior to the financial crisis of 2008. Second, core inflation—which excludes the volatile food-and-energy sector—has sunk to among the lowest levels in more than a half-century. Even the Fed is having difficulty pushing inflation up to its 2% target, and that is another downward force on interest rates. Advertisement Finally, the aging of the population, combined with the trauma of the most recent bear market, has pushed investors to settle for bonds, even though future returns are likely to be skimpy. Furthermore, tighter rules about funding corporate pensions have persuaded many firms to “de-risk” their investments by moving into bonds, pushing yields still lower. The impact of these forces is substantial. The slowdown in economic growth alone could lop off one to two percentage points from long-term interest rates, and the de-risking of pension portfolios combined with baby-boomers’ risk aversion could subtract another percentage point. At less than 3%, the recent yield on the benchmark ten-year Treasury bond is fully consistent with low inflation and slow economic growth. Bottom line: Don’t blame the Fed for low interest rates. It will raise short-term rates, currently near zero, eventually—probably next year. But if the Fed’s policy were truly inflationary, investors would send rates on long-term bonds much higher today. Barring an unforeseen crisis, low long-term rates will be with us for quite some time. Columnist Jeremy J. Siegel is a professor at the University of Pennsylvania’s Wharton School and the author of Stocks for the Long Run and The Future for Investors.