An exchange rate is used to​

 how much of your country's currency buys another foreign currency. For some countries, exchange rates constantly change, while others use a fixed exchange rate. The economic and social outlook of a country will influence its currency exchange rate compared to other countries.

Explanation:

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exchange rate. the price of one country's currency in terms of another country's currency; facilitates trade; doesn't affect money supply but affects the price of money.

Explanation:

tried to make it simple as possible :)

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.

citizens were able to charge more for their goods and services