Today we trade (aka imperialism) by paying , or going into stores , this is different from back then because we use to just give each other items in exchange for something or to learn something.
Imperialism is just another word for trade really.
i really hope this helps you a lot. :)
Answer:
I'm not sure but I think its D
Answer:
It's Demand
Two goods are substitutes if one can replace the other in consumption. If a substitute good becomes cheaper this shifts the demand curve in.
