Phenylketonuria is a(n) that can cause intellectual disability if untreated.

The correct answer is: Phenylketonuria is an inborn error of metabolism that can cause intellectual disability if untreated.  This condition is rare and inherited, that causes the body to build up a specific type of amino acid (phenylalanine). The condition makes the body's system unable to produce the enzyme that helps to break this amino acid. As a result, the individual can have an intellectual disability.

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.