Greg, who mainly smoked cigarettes when out with friends, recently quit smoking. however, each time he visits a bar or restaurant with his friends, he has the strong urge to light up a cigarette. this is an example of

This is an example of "spontaneous recovery".

Spontaneous recovery refers to a phenomenon that includes all of a sudden showing a conduct that was believed to be wiped out. This can apply to reactions that have been shaped through both established and operant conditioning. Spontaneous recovery can be characterized as the return of the conditioned reaction after a rest period or time of reduced reaction. In the event that the conditioned stimulus and unconditioned stimulus are never again related, termination will happen quickly after a spontaneous recovery.

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.

answer; collectivism;