This means that in a production system with fixed and variable inputs, beyond some point, each additional unit of variable input yields less and less additional output.

The correct answer to the following question will be "Law of Diminishing Returns".

Explanation:

This law is just an economic ideology that explains how, at a certain point, that employment doesn't yield a similarly increasing number of production. In other terms, once the sum of input increases exponentially, the amount of output declines at a certain stage per each input variable.

For eg, a factory hires employees to produce its goods and, at some stage, works at an optimum level.

Therefore, it would be the right answer.

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.