With global value chains that fragment production across the world, national statistics fail to capture the growing interconnectedness of economies. This column describes the international input-output tables that allow researchers to estimate the share of a country’s export value derived from imported inputs. However, while these tools offer promising uses, at the moment statistics on trade in value added should be treated with great caution.
Timothy J. Sturgeon, Wednesday, May 20, 2015
Leandro Prados de la Escosura, Saturday, September 27, 2014
As demonstrated by the dramatic upward revision of Nigeria’s GDP for 2013, the choice of a benchmark year matters when computing GDP statistics. This column explains how the replacement of benchmark years creates an inconsistency between new and old national accounts series, and how different ways of resolving this inconsistency yield very different estimates of historical GDP levels and growth rates. When used to evaluate the relative historical performance of Spain and France, the interpolation procedure for splicing national accounts produces more plausible results than the conventional ‘retropolation’ approach.
Jeffrey Frankel, Friday, May 9, 2014
Many claim that China will soon overtake the US. This column argues that this claim is based on a misuse of statistics. ICP price data is necessary to compare living standards, since a dollar’s worth of yuan buys more in China than a dollar buys in the US. But the fact that rice and clothes are cheap in rural China does not make the Chinese economy larger. What matters for size in the world economy is how much a yuan can buy on world markets. Using the correct prices, the US remains the world’s largest economic power by a substantial margin.
Zhi Wang, Shang-Jin Wei, Kunfu Zhu, Wednesday, April 16, 2014
One common measure of trade linked international production networks is the so-called VAX ratio, i.e. the ratio of value-added exports to gross exports. This column argues that this measure is not well-behaved at the sector, bilateral, or bilateral sector level, and does not capture important features of international production sharing. A new gross trade accounting framework is proposed that can better track countries’ movements up and down global value chains.
Zhi Wang, Shang-Jin Wei, Kunfu Zhu, Monday, April 7, 2014
The growth of international trade in intermediate inputs means that standard trade statistics can give a misleading picture of the real patterns of production behind world trade. This column introduces an accounting framework that decomposes traditional trade flows into components that better reflect the underlying location of the value addition linked to exports.