What is the relationship between intra-industry trade theory and traditional international division of labor trade theory?

The traditional theory of international division of labor is mainly aimed at the division of labor between countries, different labor productivity and different industries. However, since the 1960s, with the continuous development of science and technology, there has been a new phenomenon in international trade practice that is contrary to the conclusion of traditional trade theory, that is, international trade mostly occurs between developed countries, not between developed and developing countries; In the trade between developed countries, there is a phenomenon of both importing and exporting similar products. In order to explain this phenomenon, international economists have produced a new theory-intra-industry trade theory.

Intra-industry trade (ITT) means that a country exports and imports the same type of manufactured goods at the same time, so this kind of trade is usually called two-way trade or overlapping trade.

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Intra-industry trade theory is the international import and export trade of the same product.

The traditional international division of labor is the division of labor of different products in the world.

There is trade between similar products because different countries have different products and similar consumption. For example, in the automobile industry, A goes in and out because cars consumed domestically need not only domestic supply, but also different kinds from abroad. . .

I don't know. Have I made myself clear? I hope you can understand. .