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 answer is d. give brainliest if right.

ps is this 7th grade civics?

1) the answer is b

senators serve a six-year term; representatives serve a two-year term, making them more responsive to (and responsible for) voter confidence.

2) the answer is d

to serve as president, one must:   -be a natural-born u.s. citizen of the united states;   be at least thirty-five years old;   be a resident in the united states for at least fourteen years.

3) the answer is a

ella,because it is constitutionally eligible

4) the answer is c: the u.s president