Which of the following statements about the female hymen is correct?
a. all hymens cover the vaginal introitus to approximately the same degree.
b. the first time a female has intercourse her hymen will inevitably tear and cause bleeding.
c. most hymens have at least one opening to allow for the passage of menstrual blood.
d. an imperforate hymen is one which is virtually absent.

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.