International capital may be moving more freely through developing economies than standard measures suggest, according to new research that revisits one of the long-running puzzles in global finance. The study finds that capital mobility across selected APEC economies is real but incomplete, with developing economies showing stronger effective mobility than developed countries when assessed through household consumption patterns rather than traditional saving-investment correlations.
The research paper, titled Capital Mobility in the APEC Region: A Consumption-Based Approach and New Empirical Evidence, was published in Economies. The study examines six APEC economies, the United States, Canada, Australia, Chile, Thailand and Indonesia, over the period from 2000 to 2023, using a consumption-based framework designed to overcome limitations in the traditional Feldstein-Horioka approach to measuring international capital mobility.
Capital mobility debate gets a new test
When capital moves freely across borders, economies can draw on global savings rather than relying only on domestic funds. This can help finance investment and growth, especially in countries where domestic savings are limited. But high capital mobility also limits the ability of governments and central banks to set policy independently, as money can quickly move in response to interest rates, exchange-rate expectations and risk conditions.
Theoretically, if capital is highly mobile, domestic investment should not depend strongly on domestic saving because countries can borrow or lend internationally. But Feldstein and Horioka’s work found a surprisingly strong correlation between domestic saving and investment, suggesting that capital may be less mobile than theory predicts. That finding became known as a puzzle because it appeared to contradict the idea of increasingly integrated global financial markets.
The author argues that the traditional saving-investment method may not fully capture how capital actually moves. Saving and investment correlations can be affected by many factors that do not directly measure cross-border financial integration, including domestic policy, business cycles, demographics, public-sector balances and country-specific shocks. The study therefore adopts an alternative approach built around consumption behavior.
The logic is straightforward but important. If capital markets are integrated, consumers should be able to smooth consumption by borrowing or lending across borders when domestic income fluctuates. In that case, domestic consumption should respond not only to domestic income but also to external consumption patterns. If domestic consumption remains tightly tied to domestic income, this suggests weaker capital mobility or limited access to international capital markets. If domestic consumption moves more closely with external consumption, this points to stronger effective financial integration.
This approach follows the theoretical tradition associated with Maurice Obstfeld and later extensions by Tamim Bayoumi and Ronald MacDonald. Rather than asking whether saving and investment move together, it asks whether domestic consumption is shaped by global consumption patterns and cross-border financial integration. This provides a more direct view of whether countries can use international capital markets to smooth economic fluctuations.
The empirical focus on APEC economies gives the study added relevance. The Asia-Pacific region includes both advanced economies with mature financial systems and developing economies that have become more connected to global trade and investment networks. By comparing the United States, Canada and Australia with Chile, Thailand and Indonesia, the paper tests whether capital mobility differs systematically by development level within a shared regional framework.
The sample covers the period from 2000 to 2023, a span marked by major changes in global finance, including deeper trade integration, the rise of emerging-market capital flows, the global financial crisis, shifts in monetary policy, and the COVID-19 shock. The use of quarterly data allows the study to track the relationship between consumption, income and external consumption across multiple economic cycles.
The research also distinguishes between formal financial openness and actual capital movement. A country may have open financial regulations on paper, but that does not automatically mean capital moves in ways that affect household consumption. Conversely, a developing economy may appear less open under legal or regulatory indices but still show strong effective capital mobility if external financial conditions influence domestic consumption.
Developing economies show stronger effective mobility
The study found that capital is mobile across all six economies, but not perfectly mobile. This rejects the extremes at both ends of the debate. The economies are not financially closed, but they are also not operating under full capital mobility where global financial markets completely equalize conditions across countries.
The more striking result is that capital mobility appears stronger in the developing economies examined than in the developed economies. Thailand, Chile and Indonesia show greater effective mobility than the United States, Canada and Australia under the consumption-based measure. This challenges the common assumption that advanced economies, because of their deeper financial markets and greater formal openness, necessarily experience the highest degree of capital mobility.
The study finds that in developed countries, domestic consumption is more dependent on domestic income. This suggests that consumption behavior remains more closely tied to national economic conditions. In developing economies, by contrast, domestic consumption is more closely linked to external consumption, suggesting stronger cross-border financial influence.
This does not mean developing economies have perfect access to international capital or are free from financial frictions. The study is clear that capital mobility remains imperfect in all cases. But the evidence suggests that developing economies may be more financially connected in practice than traditional indicators imply.
The result also highlights a gap between de jure and de facto measures. De jure measures, such as capital account openness indices, typically capture laws, regulations and formal restrictions. These often rate advanced economies as more open. De facto measures, however, focus on actual outcomes and behavior. The consumption-based results suggest that formal openness may not fully reflect how capital flows affect real economic activity.
There are several possible reasons for the stronger effective capital mobility observed in developing economies. Developing countries may attract foreign direct investment because of lower labor costs, higher growth potential and less saturated markets. Investors in advanced economies may also seek diversification by allocating capital to emerging and developing markets whose returns are less closely correlated with developed-market assets. At the same time, investors in developing economies may channel funds into advanced financial markets to reduce political or domestic-market risk.
The findings also connect to the broader literature on home bias. Even in an era of globalization, investors often hold a larger share of domestic assets than standard portfolio theory would predict. This home bias can limit capital mobility in developed economies. Factors such as perceived risk, transaction costs, tax issues, information barriers and uncertainty about foreign markets may prevent investors from fully diversifying internationally.
The study notes that international diversification may not always deliver the large gains once assumed. If the benefits are modest, and if portfolio rebalancing and transaction costs are significant, investors may prefer domestic assets even when foreign investment is formally available. This can keep consumption more closely tied to domestic income in advanced economies.
When it comes to developing economies, the picture may be different. Financial inflows, external investment, remittances, trade links and exposure to international markets may create stronger ties between domestic consumption and external consumption. In these cases, households and economies may be more influenced by global capital conditions than formal openness indicators suggest.
The study’s econometric results support this interpretation. The tests reject perfect capital mobility, showing that barriers remain. They also reject autarky, showing that the economies are not closed. Non-nested model selection tests show that domestic income better explains consumption in developed economies, while external consumption better explains consumption in developing economies. This becomes the basis for the conclusion that effective capital mobility is stronger in the developing-country group.
Policy implications go beyond financial openness
If capital mobility is stronger than commonly assumed, governments cannot treat domestic policy as insulated from global financial conditions. External shocks, investor behavior and international consumption trends may influence domestic economic outcomes more directly than traditional measures suggest.
For developing economies, the results point to both opportunity and risk. Greater capital mobility can help finance investment, support growth and improve consumption smoothing. It can allow economies to draw on foreign capital when domestic resources are limited. This can be especially important for infrastructure, industrial development and private-sector expansion.
But the same mobility can create vulnerability. If capital moves quickly across borders, countries may face sudden inflows and outflows, exchange-rate pressure, asset-price volatility and constraints on monetary policy. This makes strong financial systems, transparent institutions and credible macroeconomic frameworks more important. The study suggests that developing economies should not simply liberalize capital flows without building the institutional capacity to manage them.
The research also holds significance for how capital mobility should be measured. Policymakers often rely on formal openness indicators, legal restrictions or capital-account measures. The author’s study shows that such indicators may miss important aspects of actual capital movement. A consumption-based approach can reveal whether international financial integration is affecting real domestic behavior. This gives policymakers another tool for assessing the depth and consequences of financial integration.
The findings raise a different question for developed economies. If capital mobility appears weaker than expected under a consumption-based measure, then formal openness may not translate into effective international consumption smoothing. Home bias, investor preferences, risk perceptions and domestic financial structures may continue to shape consumption and investment behavior even in advanced markets.
The results also matter for debates over globalization. The paper notes that enthusiasm for unrestricted capital mobility has weakened since recent financial crises. Some economists and policymakers have revived interest in capital flow management tools, especially when volatile capital movements threaten financial stability. The study does not call for blanket capital controls, but it does support a more careful view of financial integration. Capital mobility is not simply good or bad. Its effects depend on institutions, policy frameworks and the ability of economies to absorb shocks.
The findings fit into a wider reassessment of international finance. Capital can support growth and risk-sharing, but it can also transmit instability. For developing economies, the challenge is to attract productive and stable capital while limiting exposure to destabilizing flows. This requires stronger regulation, better financial supervision, improved market transparency and deeper domestic financial systems.
The results may also affect how economists interpret the Feldstein-Horioka puzzle. If consumption-based measures show stronger mobility than saving-investment correlations imply, then the puzzle may partly reflect measurement limitations rather than truly low capital mobility. Saving and investment data may capture domestic macroeconomic relationships, while consumption data may better reveal how households and economies interact with international financial markets.
Additionally, the study does not claim that the consumption-based method is a complete replacement for other measures. Rather, it presents the method as a complementary tool. Different measures capture different dimensions of capital mobility. Saving-investment correlations, interest parity tests, capital-account indices, gross flow data and consumption-based measures all offer partial views. The key is to use them together rather than relying on a single indicator.
The paper also underscores the importance of distinguishing between capital mobility and financial integration. Financial markets can be formally integrated without capital moving freely in ways that affect consumption. On the other hand, consumption patterns may reveal strong external influence even where regulatory openness appears limited. This distinction is crucial for both research and policy.
For APEC economies, the findings suggest that financial integration is not uniform across the region. Development level, institutional structure, investor behavior and external exposure all shape how capital mobility works in practice. The developing economies in the sample appear more sensitive to external consumption patterns, while developed economies remain more tied to domestic income. This complicates any simple ranking of capital mobility based only on financial market maturity or regulatory openness.
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