Ralph arranges with the manager of a fantasy baseball league to observe and interview members as part of his research. At the baseball "draft," Ralph introduces himself to other members of the fantasy league and they agree to let him observe the draft and allow themselves to be interviewed, although they do not allow him to join the league (as his knowledge of other members' strategies may affect how he manages his fantasy team). His role as a field researcher is that of a . a) note-taker
b) overt observer
c) participant observer
d) complete participant

b. Overt observer

Explanation:

Overt observer is process where those who are observed are aware that they are and give permission for it. When the observer participate in the overt observation it is called participatory overt observation, while when the participant doesn't join in the action it is called non-participatory overt observation. Ralph is carrying out a non-participatory overt observation as he's not playing with them.

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.