A researcher finds that the temperature of a room (cold, mild) impacts memory; a cold room is associated with worse memory. The researcher also finds that the temperature effect varies by time of year (summer, winter); the temperature effect is greater in the summer than in the winter. The fact that the temperature effect varied by time of year is an example of a .

Interaction effect

Explanation:

Interaction effect is the effect that occurs when two or more independent variables get interacted with one dependent variable at-least for producing joint effect.This effect result in more than or less tan sum of parts accordingly.

According to the question, example of interaction effect is displayed through producing more amount of impact on memory as compared to winter when memory is impacted by time and temperature gets combined as per variation.

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.