Which of the following has been confirmed by empirical tests of the Ricardian model?
A) All predictions of the model for a multi-product, multi-country world are highly unrealistic.
B) The existence of nontraded goods results in a high degree of specialization among countries.
C) International trade has no impact on income distribution.
D) The unimportance of economies of scale as a cause of trade.
E) Companies tend to export goods in which they have a relatively high level of productivity.
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