According to Elijah Anderson, Reading Terminal is a place where diverse groups can come together peacefully because the people who go there are "cosmos" (shorthand for cosmopolitan). According to his observations and interpretations, the dynamic that is largely missing from Reading Terminal is:

a. social status.
b. ethnocentrism
c. regionalization.
d. audience segregation.

b. ethnocentrism

Explanation:

Ethnocentrism is the view of things in which one's group is the center of everything,and others are scaled and rated with reference to it. Each group nouurishes its ownpride and vanity, boasts itself superior,exalts its own divinities and looks with contempt on outsides.

It is basically "Anything ou can do, we can do it better" point of view concerning ethnicity.

According to Elijah Anderson, Reading Terminal is a place where diverse groups can come together peacefully because the people who go there are "cosmos" (shorthand for cosmopolitan). According to his observations and interpretations, the dynamic that is largely missing from Reading Terminal is ethnocentrism.

trade regulation is a field of law, often bracketed with antitrust (as in the phrase “antitrust and trade regulation law”), including government regulation of unfair methods of competition and unfair or deceptive business acts or practices. antitrust law is often considered a subset of trade regulation law. franchise and distribution law, consumer protection law, and advertising law are sometimes considered parts of trade regulation law.

in general the theory of economics says that the more open to trade a country is the better   the result for the same country and the whole economies.

in real life countries impose taxes, quotas, etc which is not so good for the economies.

this kind of commercial war between the usa and china is slowing down the growth of the whole world so we can say that it is a draw back of trade regulations. and the free trade agreements are benefits of trade regulations.