Even if you focus on what seems to be the same indicator for the same year in the same country, discrepancies are large. Such differences between sources can also be found for rich countries where statistical agencies tend to follow international reporting guidelines more closely.
The Balance of Payments
And there are also large bilateral discrepancies within sources. Here we explain how international trade data is collected and processed, and why there are such large discrepancies. The data hubs from several large international organizations publish and maintain extensive cross-country datasets on international trade.
In addition to these sources, there are also many other academic projects that publish data on international trade. These projects tend to rely on data from one or more of the sources above; and they typically process and merge series in order to improve coverage and consistency. Three important sources are:. In the visualization here we provide a comparison of the data published by several of the sources listed above, country by country, since up until today.
For each country, we exclude trade in services, and we focus only on estimates of the total value of exported goods, expressed as shares of GDP. As we can clearly see in this chart, different data sources tell often very different stories. And this is true, to varying degrees, across all countries and years. Constructing this chart was demanding. It required downloading trade data from many different sources, collecting the relevant series, and then standardising them so that the units of measure and the geographical territories were consistent.
So, if all series are in the same units share of national GDP , and they all measure the same thing value of goods exported from one country to the rest of the world , what explains the differences? Broadly speaking, there are two main approaches used to estimate international merchandise trade:.
The distinction is often made because goods simply being transported through a country i. Also, adding to the complexity, countries often rely on measurement protocols that are developed alongside these approaches and concepts that are not perfectly compatible to begin with. Even when two sources rely on the same broad accounting approach, discrepancies arise because countries fail to adhere perfectly to the protocols.
Balance of payments
In theory, for example, the exports of country A to country B should mirror the imports of country B from country A. But in practice this is rarely the case because of differences in valuation. The chart here gives you an idea of how large import-export asymmetries are. Shown are the differences between the value of goods that each country reports exporting to the US, and the value of goods that the US reports importing from the same countries.
The differences in the chart here, which are both positive and negative, suggest that there is more going on than differences in FOB vs CIF values. Another common source of measurement error relates to the inconsistent attribution of trade partners. An example is failure to follow the guidelines on how to treat goods passing through intermediary countries for processing or merchanting purposes. As global production chains become more complex, countries find it increasingly difficult to unambiguously establish the origin and final destination of merchandise, even when rules are established in the manuals.
And there are still more potential sources of discrepancies. Even when two sources have identical trade estimates, inconsistencies in published data can arise from differences in exchange rates.

If a dataset reports cross-country trade data in US dollars, estimates will vary depending on the exchange rates used. Different exchange rates will lead to conflicting estimates, even if figures in local currency units are consistent. Asymmetries in international trade statistics are large and they arise for a variety of reasons. These include conceptual inconsistencies across measurement standards, as well as inconsistencies in the way countries apply agreed protocols. These factors have long been recognized by many organizations producing trade data.
Indeed, international organizations often incorporate corrections, in an attempt to improve data quality along these lines. However, this dataset has low coverage across countries, and it only goes back to There are two key lessons from all of this. The first lesson is that, for most users of trade data out there, there is no obvious way of choosing between sources. And the second lesson is that, because of statistical glitches, researchers and policymakers should always take analysis of trade data with a pinch of salt.
For example, in a recent high-profile report , researchers attributed mismatches in bilateral trade data to illicit financial flows through trade misinvoicing or trade-based money laundering. As we show here, this interpretation of the data is not appropriate, since mismatches in the data can, and often do arise from measurement inconsistencies rather than malfeasance. Hopefully the discussion and checklist above can help researchers better interpret and choose between conflicting data sources. At some universities you can access the online version of the books where data tables can be downloaded as ePDFs and Excel files.
The online access is here. Coronavirus pandemic : daily updated research and data.
External trade in goods
Summary In this entry we analyze available data and research on international trade patterns, including the determinants and consequences of globalization over the last couple of decades. Over the last two centuries trade has grown remarkably, completely transforming the global economy.
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Today about one fourth of total global production is exported. Understanding this transformative process is important because trade has generated gains, but it has also had important distributional consequences. From a historical perspective, there have been two waves of globalization.
Trends in Australia's Balance of Payments
The first wave started in the 19th century, and came to an end with the beginning of the First World War. The second wave started after the Second World War, and is still continuing. Trade transactions include both goods tangible products that are physically shipped and services intangible commodities, such as tourism and financial services.
The production chains for these goods and services are becoming increasingly complex and global. Most trade theories in the economics literature focus on sources of comparative advantage. These theories postulate that all nations can gain from trade if each specializes in producing what they are relatively more efficient at producing, based on their strengths.
The empirical evidence shows that comparative advantage is indeed relevant; but it is not the only force driving incentives to specialization and trade. All our charts on Trade and Globalization Air transport, freight ton-km Difference in the value of goods exported to and imported by the US Difference in the value of goods exported to and imported by the US vs. Related research entries in Our World in Data: Is trade a major driver of income inequality? Is globalization an engine of economic development? Trade has changed the world economy. Trade has grown remarkably over the last century. Click to open interactive version.
Trade has grown more than proportionately with GDP. Today trade is a fundamental part of economic activity everywhere. Trade generates efficiency gains. The raw correlation between trade and growth. Causality: Evidence from cross-country differences in trade, growth and productivity.
U.S. International Trade in Goods and Services
Causality: Evidence from changes in labor productivity at the firm level. Wrapping up: Trade does generate efficiency gains. Trade has distributional consequences. Evidence from Chinese imports and their impact on factory workers in the US. Exposure to rising Chinese imports and changes in employment across local labor markets in the US — Autor, Dorn and Hanson Evidence from the expansion of trade in India and the impact on poverty reductions. Evidence from other studies. He finds railroads increased trade, and in doing so they increased real incomes and reduced income volatility.
He finds the effect was progressive: poor households gained more than middle-income households, because prior to the reform, trade protection benefitted the rich disproportionately. Distribution of total household welfare gains from the arrival of foreign retail chains in Mexico — Atkin, Faber, and Gonzalez-Navarro Two points are worth emphasising.
Trade from a historical perspective. Before the first wave of globalization, trade was driven mostly by colonialism.
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The first wave of globalization was marked by the rise and collapse of intra-European trade. The second wave of globalization was enabled by technology. Changing trade partners. Trade around the world today. Trade openness around the world.