The principle of laissez–fairs states that ? a.all citizens of a certain age should have a right to vote b. government should control all aspects of business c. government should not interfere with the operations of business d. worker should not have the right to strike which one is is

I believe the answer is c.  Government should not interfere with the operations of business

Baumol treats explicitly the advertising form of non-price competition. Thus, oligopoly firms are interested not in price wars but in non-price competition to boost sales. ... This is because of the fact that a cut in price, in all probabilities, will increase total revenue.