Economic Letter

The natural rate of unemployment, or u-star, is used by economists and policymakers to help assess the overall state of the labor market. However, the natural rate is not directly observable and must be estimated. A new statistical approach estimates the natural rate over the past 100 years. Results suggest the natural rate has been remarkably stable over history, hovering between 4.5 and 5.5% for long periods, even during the Great Depression. Recent readings on the unemployment rate have been running slightly below the natural rate estimate.

As the economy has transitioned from recovery to expansion, the role of monetary policy has shifted to sustaining the expansion by gradually moving conventional and unconventional policy back to normal. But monetary policy is reaching its limit for stimulating growth, calling for private and public sector investments and policies to step up and take the lead. The following is adapted from a presentation by the president and CEO of the Federal Reserve Bank of San Francisco to the Economic Club of Las Vegas in Las Vegas on August 2.

The pace of business start-ups in the United States has declined over the past few decades. Economic theory suggests that business creation depends on the available workforce, and data analysis supports this strong link. By contrast, the relationship between start-ups and labor productivity is less well-defined, in part because entrepreneurs face initial costs that rise with productivity, specifically their own lost income from alternative employment. Overall, policies that incorporate improving labor availability may help to boost new business growth.

Demographic factors like slowing population and labor force growth, along with a global productivity slowdown, are fundamentally redefining achievable economic growth. These global shifts suggest the disappointing growth in recent years is a harbinger of the future. While the causes of the growth slump are well defined, the consequences will be shaped by choices that policymakers are grappling with around the globe. The following is adapted from a presentation by the president and CEO of the Federal Reserve Bank of San Francisco at Macquarie University, Sydney, Australia, on June 27.

Interest rates in the United States have diverged from the rates of other countries over the past few years. Some commentators have voiced concerns that, as a result, exchange rates might be more sensitive to unanticipated changes in U.S. interest rates now than they were historically. However, an examination of market-based measures of policy expectations finds no convincing evidence that the U.S. dollar has become more sensitive since 2014.

Interest rates during the current economic recovery have been unusually low. Some have argued that yields have been pushed down by declines in longer-run expectations of the normal inflation-adjusted short-term interest rate—that is, by a drop in the so-called equilibrium or natural rate of interest. New evidence from financial markets shows that a decline in this rate has indeed contributed about 2 percentage points to the general downward trend in yields over the past two decades.

Investors’ demand for safe assets tends to increase when there’s more uncertainty, as in recessions. Consistent with this idea, short-term movements in the natural rate of interest, or r-star, are negatively correlated with an index of macroeconomic uncertainty. This relationship may be relevant for assessing monetary policy. An estimated policy rule that incorporates both r-star and the uncertainty index can largely reproduce the path of the federal funds rate since 1988, except during periods when policy was constrained by the zero lower bound.