Instead of solely examining background factors, what does the sociologist jack katz think sociologists should study when trying to understand deviance?

What distinguishes Jack Katz from other sociologists is that most of the focus on the background of the individual as the maybe most important factor that predisposes them to committing deviant acts. Instead Katz argues that what the perpetrators experience while committing those acts can help researchers better understand their actions. He shows this with the example of a young shoplifter who shoplifts not  because he needs the thing he steels but because he likes the rush of the act itself. 

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.