What type of trade were the early country-based theories of international trade most useful in understanding?

Question

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The early country-based theories of international trade, such as those proposed by Adam Smith and David Ricardo, were most useful in understanding trade in commodities. These theories focused on the comparative advantage that countries have in producing certain goods based on their natural resources and labor force. They did not account for the trade in services, brand name goods, or high-tech goods, which have become increasingly important in the modern global economy.

What Type of Trade Were the Early Country-Based Theories of International