Researchers have developed interval-contingent, signal-contingent, and event-contingent report methods to
a. reduce memory distortions in self-report measures.
b. amplify memory distortions in self-report measures.
c. increase the role of values in the research process.
d. observe participants’ behavior unobtrusively.

The answer is a. reduce memory distortions in self-report measures.

Explanation:

Researchers have developed interval-contingent, signal-contingent, and event-contingent report methods to minimize errors in self-report due to distorted memory, and give a view about the nature of a person’s belief system and perceptions about life.

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.

this question does't support enough resioning to answer.