When infants repeat actions that bring interesting or pleasurable results, primarily with people or objects in their environment, they are most likely in the sensorimotor substage.

Secondary circular reaction

Explanation: this occurs between babies of about 4-8months. Here, children acquiring pleasure from toys, object in their environment by playing with them. In this stage, children uses items or object to learn about the world. They use object by throwing them, playing with them and when they derive pleasure or happiness from playing with it, they become happy and do it continuously. In this substage, children do things and mostly expect reaction from the environment. Example they throw toys and the sound of it hitting the ground will make them happy or sad. And they will continuous do that action if they are happy with the sound it makes or find pleasure in them.

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.