Does Immigration Mitigate Aging-Led Ineffectiveness of Monetary Policy for Economic Growth in OECD Countries?  

In the advanced economies of the world, a quiet demographic shift is reshaping the landscape of daily life and national policy. For decades, these nations have relied on a steady stream of young workers to fuel their factories, offices, and service industries. However, a combination of people living longer and having fewer children has begun to tip the balance. The proportion of elderly citizens is rising rapidly, while the pool of working-age adults shrinks. This creates a fundamental problem for the tools governments use to manage their economies. One of the primary tools is monetary policy, which essentially involves a central bank adjusting the cost of borrowing money to encourage or slow down spending. When the economy is healthy, lowering interest rates usually prompts businesses to invest and people to buy homes, sparking growth. But in an aging society, this mechanism often stalls. Older populations tend to save rather than spend, and with fewer workers available, businesses cannot easily expand even if money is cheap. The result is a situation where the usual levers of economic control lose their grip, leaving nations struggling to grow despite their best efforts.

Researchers Rajarshi Mitra and Md. Thasinul Abedin set out to investigate whether a specific solution could restore the power of these economic levers. They focused on ten wealthy nations that are part of the Organization for Economic Co-operation and Development, including Japan, the United States, and several European countries. These nations are all grappling with the same issue: a rapidly aging population that is weakening the effectiveness of their monetary policies. The central question of their study was whether bringing in foreign workers through immigration could fix this problem. The idea is that an influx of new workers, who are typically younger and more likely to spend and invest, could replenish the labor force and reignite the demand needed for monetary policy to work again.

To find the answer, the team analyzed annual data spanning two decades, from 2001 to 2021. They looked at how changes in the money supply, the age structure of the population, and the flow of migrants interacted with the economic growth of these ten countries. Their analysis confirmed what many economists had long suspected: as the proportion of elderly people in a country increases, the ability of monetary policy to stimulate economic growth diminishes. In the countries with the oldest populations, the traditional method of lowering interest rates to spur activity became significantly less effective. The data showed that when the dependency ratio—the number of elderly people relative to the working-age population—was high, the economic engine simply did not respond to the usual signals from the central bank.

However, the study uncovered a crucial counterbalance. The researchers found that an increase in net migration, which represents the number of people moving into a country minus those leaving, acts as a powerful remedy. When a country welcomes more foreign workers and their families, it does more than just fill empty job slots. These new residents bring immediate demand for housing, food, and services, and they often enter the workforce at ages when they are most productive. The study demonstrated that this influx of people effectively offsets the weakening effects of an aging population. In countries where immigration flows were higher, the link between monetary policy and economic growth remained strong. The presence of these new workers meant that when interest rates were lowered, businesses were more willing to borrow and expand because there was a larger, more active consumer base to buy their products.

The findings suggest that the effectiveness of economic management in the modern world is not just about interest rates or government spending, but also about who is living in the country. The research indicates that in nations where the population is getting older, the policy of welcoming immigrants is not merely a social or humanitarian decision, but a vital economic strategy. By increasing the supply of labor and boosting domestic demand, immigration helps to keep the transmission mechanism of monetary policy alive. However, the authors acknowledge significant limitations in their analysis. They note that their method of using past data to predict future trends may not be sufficient to fully prove that immigration causes these results, as migration is deeply tied to economic conditions and policy choices. Furthermore, the study highlights that a lack of detailed data on short-term versus long-term migration prevents a more precise understanding of these effects. Without this influx, the study suggests that aging economies risk falling into a state where traditional tools fail to prevent stagnation, but the authors conclude that while the evidence points to immigration strengthening monetary policy, these findings provide a basis for future research to address the remaining uncertainties. In advanced industrialized countries, an increase in the share of net migration is expected to strengthen monetary policy effectiveness and boost economic growth, though the authors caution that more data is needed to fully confirm these causal links.