Country diversification, product ubiquity, and economic divergence

Countries differ markedly in the diversification of their exports. Products differ in the number of countries that export them, which we define as their ubiquity. We document a new stylized fact in the global pattern of exports: there is a systematic relationship between the diversification of a country’s exports and the ubiquity of its products. We argue that this fact is not implied by current theories of international trade and show that it is not a trivial consequence of the heterogeneity in the level of diversification of countries or of the heterogeneity in the ubiquity of products. We account for this stylized fact by constructing a simple model that assumes that each product requires a potentially large number of non-tradable inputs, which we call capabilities, and that a country can only make the products for which it has all the requisite capabilities. Products differ in the number and specific nature of the capabilities they require, as countries differ in the number/nature of capabilities they have. Products that require more capabilities will be accessible to fewer countries (i.e., will be less ubiquitous), while countries that have more capabilities will have what is required to make more products (i.e., will be more diversified). Our model implies that the return to the accumulation of new capabilities increases exponentially with the number of capabilities already available in a country. Moreover, we find that the convexity of the increase in diversification associated with the accumulation of a new capability increases when either the total number of capabilities that exist in the world increases or the average complexity of products, defined as the number of capabilities products require, increases. This convexity defines what we term as aquiescence trap, or a trap of economic stasis: countries with few capabilities will have negligible or no return to the accumulation of more capabilities, while at the same time countries with many capabilities will experience large returns – in terms of increased diversification – to the accumulation of additional capabilities. We calibrate the model to three different sets of empirical data and show that the derived functional forms reproduce the empirically observed distributions of product ubiquity, the relationship between the diversification of countries and the average ubiquity of the products they export, and the distribution of the probability that two products are co-exported. This calibration suggests that the global economy is composed of a relatively large number of capabilities – between 23 and 80, depending on the level of disaggregation of the data – and that products require on average a relatively large fraction of these capabilities in order to be produced. The conclusion of this calibration is that the world exists in a regime where the quiescence trap is strong.

Marriage, Education, and Assortative Mating in Latin America

In this paper we establish six stylized facts related to marriage and work in Latin America and present a simple model to account for them. First, skilled women are less likely to be married than unskilled women. Second, skilled women are less likely to be married than skilled men. Third, married skilled men are more likely to work than unmarried skilled men, but married skilled women are less likely to work than unmarried skilled women. Fourth, Latin American women are much more likely to marry a less skilled husband compared to women in other regions of the world. Five, when a skilled Latin American woman marries down, she is more likely to work than if she marries a more or equally educated man. Six, when a woman marries down, she tends to marry the “better” men in that these are men that earn higher wages than those explained by the other observable characteristics. We present a simple game theoretic model that explains these facts with a single assumption: Latin American men, but not women, assign a greater value to having a stay-home wife.

This research is part of the “Closing the Global Gender Gap: A Call to Action,” an initiative sponsored by the Women and Public Policy Program in collaboration with the Center for International Development at Harvard University, with support from ExxonMobil’s Educating Women and Girls Initiative and the Women’s Leadership Board of the Harvard Kennedy School.

Structural Transformation in Ecuador

This paper applies new techniques and metrics to analyze Ecuador’s past record of and future opportunities for structural transformation. Ecuador’s export dynamics and the emergence of new export activities have been the historical drivers of the country’s growth, but recently Ecuador’s export basket has undergone little structural transformation. The same broad sectors continue to dominate, and the overall sophistication of the export basket has actually declined in recent years. In order to consider why movement to new, more sophisticated export activities has lagged in Ecuador, we examine export connectedness and find that the country is concentrated in a peripheral part of the product space. We quantitatively scan Ecuador’s efficient frontier and identify new, high-potential export activities that are nearby in the product space. This sector evaluation provides valuable information for the government to prioritize dialogue and interventions, but it is not meant to be a conclusive identification of “winners”. Rather, we provide policy guidelines to facilitate the emergence of these and other new export activities, dealing with the sector-specificity of much of what the government must provide to the private sector to succeed while at the same time avoiding the well-known perils of traditional industrial policies.

Redemption or Abstinence? Original Sin, Currency Mismatches, and Counter-Cyclical Policies in the New Millenium

This paper updates our previous work on the level and evolution of original sin. It shows that while the number of countries that issue local-currency debt in international markets has increased in the past decade, this improvement has been quite modest. Although we find that countries have been borrowing at home, thanks to deepening domestic markets, we document that foreign participation in these markets is more limited than what is usually assumed. The paper shows that the recent decline of currency mismatches and the consequent ability to conduct countercyclical macroeconomic policies is due to lower net debt (abstinence) and not to redemption from original sin. We conclude that original sin continues to make financial globalization unattractive and developing countries have opted for abstinence because foreign currency debt is too risky. The promised paradise of financial globalization will need to wait for redemption from original sin. 

Policies for Achieving Structural Transformation in the Caribbean

Countries seldom grow rich by producing the same things more productively. They usually change what they produce in the process of development. Structural transformation is the process whereby countries move to new economic activities that are more productive and thus are able to pay higher wages. This process is very important for growth: countries that are able to upgrade their exports by developing new economic activities tend to grow faster (Hausmann and Rodrik, 2003; Hausmann, Hwang, and Rodrik, 2006).

The purpose of this paper is to apply new methodologies to analyze the history of and future opportunities for structural transformation in the Caribbean. We first look at the composition of exports from the Caribbean, and show that the region is specialized in relatively unsophisticated, ―poor-country‖ export products, and this is not simply a consequence of their small size or specialization in tourism and financial services.

We then review the concept of the ―product space‖ and determine where the Caribbean countries are specialized within this space. The results show that generally these countries export peripheral products that are intensive in capabilities with few alternative uses. In addition, we consider what effects regional integration would have on this opportunity set and show that future opportunities for structural transformation are much higher for the Caribbean Community (CARICOM) as a perfectly integrated zone—higher than for any of its members on their own.

The final section discusses the policy implications of these results. We show that for almost all countries in the Caribbean there is a need to move to new export activities. Some countries in the region have a set of nearby activities they could exploit, including in the services sector, which suggests a parsimonious approach to promoting new activities is appropriate. This approach involves the government better orienting itself to learn what emerging sectors need in the way of publically provided inputs. But for many countries in the region, there are few nearby activities, suggesting a more proactive search process is necessary. In the appendix we apply the product space data to this search for nearby and more distant export activities for Belize and Jamaica. However, such data is merely a starting point for what must be a continuous process of high-bandwidth dialogue with the private sector to learn what is needed for new activities to emerge. We provide general design guidelines for such a dialogue, both for nearby and more distant activities, and we outline some specific initiatives as examples.

The Building Blocks of Economic Complexity

For Adam Smith, wealth was related to the division of labor. As people and firms specialize in different activities, economic efficiency increases, suggesting that development is associated with an increase in the number of individual activities and with the complexity that emerges from the interactions between them. Here we develop a view of economic growth and development that gives a central role to the complexity of a country’s economy by interpreting trade data as a bipartite network in which countries are connected to the products they export, and show that it is possible to quantify the complexity of a country’s economy by characterizing the structure of this network. Furthermore, we show that the measures of complexity we derive are correlated with a country’s level of income, and that deviations from this relationship are predictive of future growth. This suggests that countries tend to converge to the level of income dictated by the complexity of their productive structures, indicating that development efforts should focus on generating the conditions that would allow complexity to emerge in order to generate sustained growth and prosperity.

Last updated on 12/10/2021

In Search of the Chains that Hold Brazil Back

This paper performs a Growth Diagnotic for Brazil. It shows that many aspects of the Brazilian economy have been improving including the macro picture, educational progress and the external front. Moreover, Brazil has many productive possibilities and high-return investments. Yet growth is hampered because of a relatively old-fashioned problem that has been solved in many other countries in the region: creating a financially viable st ate that does not over-borrow, over-tax or under-invest. We show that domestic saving is the binding constraint on growth and that it has a fiscal cause. Although things are trending in the right direction, the challenge is to exploit the current good times to create the fiscal basis for a sustained growth acceleration.

Doing Growth Diagnostics in Practice: A ‘Mindbook’

This paper systematizes the implementation of the Growth Diagnostics framework. It aims to give the meta-steps that a persuasive growth diagnosis should have, and elaborates on the strategies and methods that may be used. Rather than a step-by-step instruction manual or handbook, this paper is meant to be a ‘mindbook’, suggesting how to think about the problem of identifying a country’s constraints to growth.

Growth Diagnostics in Peru

This paper presents a growth diagnostic of Peru. It notes that although Peru has recently enjoyed high rates of economic growth, this growth is actually a recovery from a significant and sustained growth collapse that began in the 1970s. The growth collapse was caused by a decline in export earnings due to the fall in international prices and an inadequate investment regime in export activities that led to a fall in market share. This situation led to collateral damage in the form of a balance of payments, fiscal and financial crisis, accompanied by hyperinflation and violence, but these aspects were corrected in the 1990s. However, the transformation of the export sector has been surprisingly small: the same activities that declined – mining and energy – are the ones that are leading the current recovery in exports to levels that in real per capita terms are similar to those achieved 30 years ago. We argue that the lack of structural transformation is associated with Peru’s position in a poorly connected part of the product space and this accentuates coordination failures in the movement to new activities. In addition, Peru’s current export package, is very capital intensive and generates few jobs, especially in urban areas where the bulk of the labor force is now located. This limits the welfare benefits of the current growth path. The key policy message is that the public sector must act to encourage the development of new export activities that better utilize the human resources of the country. This involves action on the macro front to achieve a more competitive real exchange rate, improvements in the capacity to solve coordination failures in the provision of specific public sector inputs and programs to stimulate investment in new tradable activities.

The Other Hand: High Bandwidth Development Policy

Much of development policy has been based on the search for a short to-do list that would get countries moving. In this paper, I argue that economic activity requires a large and highly interacting set of public policies and services, which constitute inputs into the production process. This is reflected in the presence, in all countries, of hundreds of thousands of pages of legislation and hundreds of public agencies. Finding out what is the right mix of the public inputs, and more importantly, what is a valuable change from the current provision is as complex as determining what is the right mix of private provision of goods. In the latter case, economists agree that this process cannot be achieved through central planning and that the invisible hand of the market is the right approach, because it allows decisions to be made in a more decentralized manner with more information. I argue that a similar solution is required to deal with the complexity of the public policy mix.