HELP ASAP PLEASE!!!!

1. The U.S. government helps protect the economy and competition

by promoting a command economy
by establishing laws and regulations
by letting the economy regulate itself
by providing goods and services

2. A company 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.