Acompany released a new video game system just in time for christmas and many stores quickly sold out. although the price of the system was only $350, they sold for over $2,000 on an online auction site. which of the following economic principles best explains this event?
people respond to incentives because of self-interest.
the value of some objects increases relative to other objects.
the price of all goods will rise over time.
competition among consumers increases prices.

I think that the answer is Competition among consumers increases prices.

Explanation:

the hyksos invasion. the hyksos were able to attack egypt successfully because of their skills in using bronze weapons, composite bows and the use of the horse and chariot during the invasion. although the egyptians depict a barbarian-type overthrow, the truth is the seizure was likely a relatively peaceful one.

a social contract.

"a social contract is an agreement between citizens and their leader where the citizens give up certain freedoms in exchange for protection. the constitution of the united states is an example of a social contract."