Nation is its citizens and Jefferson stresses basically that that is why the people must participate in the government. The government is of the people for the people which means that the government is made up from the citizens of the United States. It is those same citizens that, by their right to vote, choose who will do their will in the government. Precisely because the people choose who will be in the government is the reason why they must be more active as it will decide what policies were going to be pushed. Here we are talking about the state governments as Jefferson opposed a strong federal government.
The government can limit negative externalities of a highway by imposing a congestion toll that can help in free movement of vehicles. Negative externalities on the highway result from too many drivers using the highway and congestion which can also be reduced through a congestion toll
Sigmund Freud's theory of psychoanalysis and Alfred Adler's theory of individual psychology are different in many ways. One difference in the two theories of Freud and Adler was that Freud split the personality into components and Adler thought the individual should be studied as a whole.