The meaning of, "who would pick someone who smells like fish and mud? who would pick an unpopular tax collector? who would pick leaders from filthy wharves and toil-filled fields? but he did, and together they changed the world," is

The answer is: The effective leader multiplies accomplishment through delegation

Effective leaders would have the awareness that they could never achieved success without the collective help of their team members.

Because of this, most of the time they need to learn to trust other people and delegate some of the power to them.

To do this, the leaders need to realize that they sometimes need to rely on the people that have different expertise and characteristics with them. (which is why the references on different type of people form different backgrounds exist in the quote)

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; overt behavior;