During this era, which two economic philosophies were predominant? . a.physiocracy and valuism. b.communism and socialism. c.mercantilism and capitalism. d.marginalism and monetarism.

Considering the fact that you are talking about the 18th century, the two economic philosophies that were predominant were mercantilism and capitalism. The correct option among all the options that are given in the question is the third option or option "C". I hope it helps you.

It could drastically affect the development of countries because the citizens would not be able to safely travel from place to place quickly