Legal slavery, usually the result of military conquest, is unjust because not all the conquered people are slaves by nature. If someone who is not a natural slave is enslaved by force, the situation is disadvantageous both to the master and the slave. Chapter 7 Mastery and political rule are not the same thing, because political rule is over those who are free and equal. Chapter 8 Let us now examine expertise in business as compared to household management. The two are not the same, because businesses supply and households consume.
Household management is a type of expertise for the acquisition of life's necessities.
Chapter 9 Business expertise is also a type of acquisitive expertise. Expertise in commerce is distinct from expertise in business because the former involves exchange. Commerce arose from creation of money as a result of necessary exchange. Business expertise is the same type as household expertise. The difference is that in business there is no limit, because the amount of wealth continually increases.