Both the wealth of nations and the declaration of independence share the point of view that

The common denominator between the "Wealth of Nations" and the Declaration of Independence, on the issue of the economy, and the function of the government in this particular aspect is that both established that people are better left alone in terms of trade and economy, that they will look out for their own welfare, and thus become self-regulatory, and thus governments should not interfere in this process. Basically, people are to be left alone to fend for themselves in terms of economy.

Explanation:

The Declaration of Independence, and the "Wealth of Nations" written by Adam Smith, defend the position of little government interference in matters of economy, market and trade. According to both documents, people are always looking out for their self-interest and thus, left alone and without interference from government policies, will by themselves regulate commerce, and the economy and make the best choices.