According to Adam Smith, the factors that determine the size of a society's industry are: The division of labor and personal interest.
In his most important work, "The Wealth of Nations" (1776) Adam Smith expresses his economic ideas. One of the main topics he deals with in this text is labor.
According to Adam Smith, he expresses that the improvement of productivity (which influences the growth or decrease of the industry) of labor depends to a large extent on its division. In other words, what Adam expresses is that the division of labor allows companies and workers to have higher profits and productivity by making a society's industry bigger.
On the other hand, Adam Smith emphasizes that personal interest is that "motivation" that individuals use to include themselves in the economic system and obtain personal benefits. According to the above, men are involved in the economic system motivated by their personal interest to obtain a profit but they are generating benefits for everyone, even for the growth of companies and industries.
According to the above, the correct answer is The division of labor and personal interest.
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