Person:
Pierola Castro, Martha Denisse
Author Name Variants
Fields of Specialization
International economics,
Export development,
Firm-level analysis of trade
Degrees
External Links
Departments
Trade and Integration Team, Development Research Group, The World Bank
Externally Hosted Work
Contact Information
Last updated
January 31, 2023
Biography
Martha Denisse Pierola is an Economist in the Trade and International Integration Unit of the Development Research Group of the World Bank. She has published several papers on export growth and exporter dynamics and co-created the Exporter Dynamics Database –the first-ever global database on exporter growth and dynamics, based on firm-level export data. Her research studies the role of large exporters in driving trade patterns and export growth; and examines how exporter behavior varies with the stage of development. She was the leader of the team conducting the World Bank study on trade, competitiveness and regional integration in Zimbabwe. She has worked on issues related to regionalism, trade costs and trade and productivity. Before joining the World Bank, she worked as an economist for the Peruvian Government (INDECOPI) and also consulted for the private sector and other international organizations. She has a PhD in economics from the Graduate Institute of International Studies in Geneva, Switzerland and a Master of International Law and Economics from the World Trade Institute in Bern, Switzerland.
Publication Search Results
1 - 9 of 9
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Publication
Export Surges : The Power of a Competitive Currency
(World Bank, Washington, DC, 2008-10)How can countries stimulate and sustain strong export growth? To answer this question, the authors examine 92 episodes of export surges, defined as significant increases in manufacturing export growth that are sustained for at least seven years. They find that export surges in developing countries tend to be preceded by a large real depreciation-which leaves the exchange rate significantly undervalued-and a reduction in exchange rate volatility. In contrast, in developed countries, the role of the exchange rate is less pronounced. The authors examine why the exchange rate is so important in developing countries and find that the depreciation leads to a significant reallocation of resources in the export sector. In particular, depreciation generates more entries into new export products and new markets, and the percentage of new entries that fail after one year declines. These new products and new markets are important, accounting for 25 percent of export growth during the surge in developing countries. The authors argue that maintaining a competitive currency leads firms to expand the product and market space for exports, inducing a large reorientation of the tradable sector. -
Publication
Exporter Dynamics Database
( 2012-10)This paper introduces the Exporter Dynamics Database. The database includes exporter characteristics and measures of exporter growth based on firm-level customs information from 38 developing and seven developed countries, primarily for the period between 2003 and 2010. The measures are available at different levels of aggregation, including: a) country-year, b) country-year-product, and c) country-year-destination. Several new stylized facts about exporter behavior across countries emerge from the database. (i) Larger or more developed economies have more exporters, larger and more diversified exporters, and lower entry and exit rates than smaller or developing economies. (ii) In the short run, expansions along the intensive margin (exporter size) contribute more to export growth than expansions along the extensive margin (number of exporters). (iii) Exit rates are highly correlated with entry rates and both are negatively correlated with survival rates, average exporter size, and diversification. (iv) The number of exporters and the entry and exit rates in a country-product group are partially driven by country and product-group effects; however, the average size of exporters in a country-product group is not. Although the first three facts can be explained by models incorporating firm heterogeneity and uncertainty, the fourth fact is more difficult to explain with existing models. Several findings are confirmed in this database, including the importance of large multi-product firms. This database can be a valuable tool to improve the understanding of the micro-foundations of export growth, by providing new insights about exporter characteristics and dynamics. -
Publication
Export Superstars
(World Bank, Washington, DC, 2012-10)This paper shows that the top 1 percent of exporters critically shape trade patterns, using firm-level data from 32 countries. In particular, variation in average firm size (the intensive margin) explains over two thirds of the variation in the sector distribution of exports across countries, the remaining share is explained by variation in the number of firms (the extensive margin). Variation in average firm size across sectors is largely driven by variation in the sectoral distribution of exports from the top 1 percent of firms in a country -- export superstars. In contrast, the sectoral distribution of exports from the remaining 99 percent of firms is more similar across countries, and the distribution of the total number of firms across sectors is very similar across countries. This paper also finds that current export superstars typically entered the export market relatively large, reached the top 1 percent after less than three years of exporting, and account for more than half of a country's total exports, export growth and diversification. The results underscore the role of individual firms in determining both trade volumes and trade patterns. -
Publication
Pathways to African Export Sustainability
(Washington, DC: World Bank, 2012-07-02)This report provides tentative leads toward such policy prescriptions, based on an overview of the empirical evidence. Chapter one sets the stage by putting Africa's export-survival performance into perspective and proposing a framework that will guide the interpretation of empirical evidence throughout the report. Chapter two covers country-level determinants of export sustainability at origin and destination, including the exporting country's business environment. Chapter three explores some of the firm-level evidence on what drives export sustainability, including uncertainty, incomplete contracts, learning, and networks. Finally, chapter four offers tentative policy implications. The main conclusions from this overview of the causes of Africa's low export sustainability should be taken with caution both because of the complexity of the issue and because of the very fragmentary evidence on which the overview is based. The author should be more cautious in drawing policy implications, as hasty policy prescriptions are the most common trap into which reports of this kind can fall. A first, solid conclusion is that the author needs substantial additional work on the nature and causes of low export survival rates in developing countries to determine the path to high export sustainability. -
Publication
Exporter Behavior, Country Size and Stage of Development: Evidence from the Exporter Dynamics Database
(World Bank, Washington, DC, 2015-10)This paper presents new data on the micro structure of the export sector for 45 countries and studies how exporter behavior varies with country size and stage of development. Larger countries and more developed countries have more exporters, larger exporters, and a greater share of exports controlled by the top 5 percent. The extensive margin (more firms) plays a greater role than the intensive margin (average size) in supporting exports of larger countries. In contrast, the intensive margin is relatively more important in explaining the exports of richer countries. Exporter entry and exit rates are higher and entrant survival is lower at an early stage of development. The paper discusses the results in light of trade theories with heterogeneous firms and the empirical literature on resource allocation, firm size, and development. An implication from the findings is that developing countries export less because the top of the firm-size distribution is truncated. -
Publication
Export Competitiveness: Why Domestic Market Competition Matters
(World Bank, Washington, DC, 2015-06)This review of the empirical literature shows that industries with more intense domestic competition will export more. Competition law enforcement can be traced to export performance and is complementary to trade reforms. Pro-competition market regulation that reduces restrictions and promotes competition, where it is viable, is an important determinant for trade. The elimination of barriers to entry and rivalry, and a level playing field in upstream sectors contributes to export competitiveness in downstream manufacturing sectors. In some sectors, effective competition policy can directly lower trade costs. -
Publication
Export Entrepreneurs : Evidence from Peru
( 2010-08-01)This paper examines firm entry and survival in exporting, and in products and markets not previously served by any domestic exporters. The authors use data on the nontraditional agriculture sector in Peru, which grew seven-fold from 1994 to 2007. They find tremendous firm entry and exit in the export sector, with exits more likely after one year and among firms that start small. There is also significant entry and exit in new markets. In contrast, such trial and error in new products is rare. New products are typically discovered by large experienced exporters and there is increased entry after products are discovered. The results imply that high sunk costs of entry are of concern for product discovery, especially for products that are not consumed domestically. In contrast, the tremendous entry and exit in exporting and in new markets suggests that initial sunk costs are relatively low. The authors develop a model that explains how entrepreneurs decide to export and to develop new export products and markets when there are sunk costs of discovery and uncertainty about idiosyncratic costs. The model explains many features of the data. -
Publication
Success and Failure of African Exporters
( 2011-05-01)Using a novel dataset with transactions level exports data from four African countries (Malawi, Mali, Senegal and Tanzania), this paper uncovers evidence of a high degree of experimentation at the extensive margin associated with low survival rates, consistent with high and middle income country evidence. Consequently, the authors focus on the questions of what determines success and survival beyond the first year and find that survival probability rises with the number of firms exporting the same product to the same destination from the same country, pointing towards the existence of cross-firm synergies. Accordingly the evidence is consistent with the hypothesis that those synergies may be driven by information spillovers. More intuitively and consistently with multi-product firms models, the analysis also finds that firms more diversified in terms of products, but even more in terms of markets, are more likely to be successful and survive beyond the first year. -
Publication
Patterns of Export Diversification in Developing Countries : Intensive and Extensive Margins
(World Bank, Washington, DC, 2008-01)This paper uses highly disaggregated trade data to investigate geographic and product diversification patterns across a group of developing nations for the period from 1990 to 2005. The econometric investigation shows that the gravity equation fits the observed differences in diversification across nations. The analysis shows that exports at the intensive margin account for the most important share of overall trade growth. At the extensive margin, geographic diversification is more important than product diversification, especially for developing countries. Taking part in free trade agreements, thereby reducing trade costs, and trading with countries in the North are also found to have positive impacts on export diversification for developing countries.