Reshaping Keynesian ideas was recognized by the Nobel Prize! American economists Hall and Woodford reveal the underlying logic of consumer decisions and central bank policies

The Zhitong Finance App learned that the Royal Swedish Academy of Sciences announced on October 12 that the 2026 Nobel Prize in Economics will be awarded to American economists Robert Hall and Michael Woodford in recognition of their outstanding contributions in the field of microeconomics basic research in establishing macroeconomic stability policies.

These two American-based scholars reinterpreted and developed John Maynard Keynes's economic ideas after the oil crisis in the 1970s. Hall was honored for a paper published in 1978 that explored why consumers tend to maintain stable consumption levels. Since then, Woodford has further developed what is known as the “New Keynesian Model.” To this day, this model continues to have a profound impact on policymakers around the world.

The profound change brought about by Hall and Woodford's research is to establish a set of analytical methods for macroeconomic policy starting from microscopic behavior: determining how interest rates and fiscal policies will affect the entire economy by understanding how households spend, how companies set prices, and how people form expectations for the future. Today, when central banks discuss natural interest rates, output gaps, inflation expectations, and future interest rate paths, there is a theoretical foundation that the two winners promoted.

John Hasler, chairman of the Nobel Prize in Economics selection committee, said in a statement: “The research of the two winners provides a stable theoretical foundation for the models currently used by central banks and governments around the world. With these theories, we are better able to cope with economic shocks, such as the energy crisis or sudden changes in household consumption levels.”

Woodford was asked if there was an economic event or shock that could prove that the new framework he proposed had indeed withstood the test. Using the 2008 global financial crisis as an example, he pointed out that central banks faced a situation of sluggish demand, and reducing borrowing costs alone was not enough to solve the problem, so central banks adjusted their own policy tools.

“Forward-looking policy guidance has played an important role,” he said. In other words, the central bank explains more clearly the likely direction of interest rate policy in the future, rather than simply relying on immediate and further interest rate cuts. This was an important part of the policy response at the time.” “It really helps improve economic stability. It didn't magically solve all the problems, but I think it was an important contribution.”

Hall reverses research thinking: household consumption cannot be predicted in advance

Household consumption has always been one of the most important variables in macroeconomic research. Traditional theory generally assumes that when household income increases, consumption will increase accordingly. But economists have discovered that in reality, household consumption behavior is much more complicated. For example, even if the income does not increase this year, a household may increase consumption early if the income is expected to rise significantly in the next few years. Conversely, even if their current income is high, families may choose to increase their savings if they are concerned about future unemployment. This means that consumption is determined not only by current income, but also by people's future judgments.

The problem is that future revenue expectations are difficult to directly observe and measure. For a long time, economists have been searching for indicators that reflect household expectations, hoping to use them to predict changes in consumption, but it has always been difficult to achieve satisfactory results.

In 1978, Hall proposed a different line of research. He believes that if households do arrange their consumption according to expectations of future income, then the current consumption level actually already reflects the information the household has. Consumption plans need to be adjusted only when new information appears and changes the family's judgment about the future. But real new information can't be predicted until it becomes available.

From this, Hall came to a seemingly counterintuitive conclusion: if the theory holds true, changes in household consumption itself should not be able to be systematically predicted in advance. This changed the direction of the research question. Instead of looking for indicators that can accurately predict changes in consumption, economists can test whether existing variables can systematically predict future changes in consumption. Hall's research provided important empirical support for this theory, and also established a benchmark for subsequent consumer research.

In 1982, he and economist Frederick Mishkin carried out further research using household microdata and found that about 80% of the household consumption behavior in the sample was in line with the relevant theory, while the rest of the households were closer to relying on current income to maintain daily expenses. These findings help economists understand why the same fiscal or monetary policies have different effects on different households.

Woodford establishes a new model: Why is central bank expectation management so important?

If Hall helped economists understand how households decide to spend, Woodford further integrated household expectations, corporate pricing, and central bank interest rate policies into a unified macroeconomic framework.

In 2003, Woodford published a book that systematically explained New Keynesian theory, and the macroeconomic model based on microeconomics became an important model for subsequent research. At the heart of this model is to view macroeconomics as the result of a large number of household and business interactions. Households determine consumption and savings based on income expectations and interest rates, enterprises determine commodity sales prices based on production costs, market demand, and future price expectations, and central banks influence these behaviors through interest rate policies.

One important concept is the natural interest rate, a level of interest that neither stimulates nor inhibits economic activity. When the policy interest rate is lower than the natural rate, borrowing and current consumption may be stimulated; when the policy interest rate is higher than the natural interest rate, consumption and investment demand may be suppressed.

But Woodford's research further suggests that the way central banks influence the economy is not limited to current interest rates. People believe that how interest rates will change in the future can also change today's economic decisions.

For example, if a company expects future increases in production costs and other commodity prices, it may adjust pricing ahead of schedule, even if current costs have not risen significantly. Savings and consumption decisions may also change early if households expect future interest rates to fall. Therefore, the ability of the central bank to clearly and authentically explain policy goals and future actions to the market plays an important role in stabilizing economic expectations. This also provides a theoretical basis for modern central banks to attach great importance to policy statements, interest rate guidelines, and inflation expectations.

Another important contribution of the Woodford model is to help economists differentiate between the different effects of changes in demand and supply shocks on the economy. For example, when the price of oil suddenly rises, the production costs of enterprises increase, and the goods and services that the economy can provide may decrease. Even if consumers do not increase spending, economic demand may appear too high compared to production capacity after the decline, thus driving inflation. Under such circumstances, simply stimulating consumption may further widen the imbalance between supply and demand, while raising interest rates and moderately curbing demand may help control inflation.

Woodford uses concepts such as output gaps to compare actual economic output with natural output levels, providing analytical tools to determine whether economic demand is too strong. This framework allows policymakers to more systematically analyze the impact of rising energy prices, supply chain disruptions, and other external shocks.