Whenever a company purchases it's from countries, it must pay a tax to the government. What is this an example of?

Pls help

answer; i believe the correct answer is (the willamete valley);

explanation:

the addition to geographic boundaries that might have  kept the people of the huang river civilization from traveling to far distance region is that they had learned about the other river valley civilizations but feared contact would bring invasion.

hope this .

plz give me brainliest!

here is a link that will you.