The measurement error may come from any number of omitted variables.
Researchers also found that when the dependent variable is relative exports, productivity shows slightly better results than unit labor costs, but the reverse is the case when the dependent variable is bilateral trade balances.
In other words, the authors discovered 'fairly strong [empirical] support" for the Ricardian model despite the intense difficulties in structuring international comparisons between productivity and labor compensation (although the authors found their PPP approach valuable). The authors concluded that:
in the vast majority of cases, relative productivity and unit labor cost help to explain U.S. bilateral trade pattern, particularly when sector-specific purchasing-power-parity exchange rates are used. In most cases, only a small part of the variation of trade patterns is explained by the model, but this is common in cross-sectional analysis (Golub & Hseih (2000), p.231).
They concluded that "despite its extreme simplicity, the Ricardian model continues to perform surprisingly well empirically." (ibid.)
Golub and Hseih (2001) were not the only ones who provided empirical support for the Ricardian theory. The Hungarian economist, Bela Balassa, provides further evidence of the confirmation of the Ricardian model. Comparing the ratio of U.S. To British labor productivity, in 1951, for 26 manufacturing industries, he discovered that a positive correlation existed between labor productivity and exports (Choi, & Kwan, 2002 )
In a series of time-series research, Ashenfelter and Jurajda (2001) indicated that wage changes over time corresponded sharply with productivity changes, as see for instance this figure of the U.S.A. where an upward drift in wages between 1973 to 2000 showed a corresponding upward curve in labor productivity. More clearly seen is in this figure of Sweden in the same years, where the fluctuating wwage level shows precisely the same fluctuating pattern in labor...
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