In the coastal united states, there is an established correlation between ice cream sales and shark attacks. which of the following might we conclude from this data?
a. eating ice cream may increase the likelihood of a shark attack.
b. increases in shark attacks may increase ice cream sales.
c. this is an anomaly and there is no relationship between shark attacks and ice cream sales.
d. there may be a third variable that creates a link between ice cream sales and shark attacks.

d. There may be a third variable that creates a link between ice cream sales and shark attacks.

Explanation:

There may be a third variable that link between ice cream sale and shark attacks.

A common error in casual thinking is the overlooking of third variable relating to the other two variables involve that better explains cause effect relationships. Third variable leads to a mistaken causal relationship between two others.

d. There may be a third variable that creates a link between ice cream sales and shark attacks.

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.