What in this chapter made you think about an economic concept differently than your previous beliefs? 

Principle 3. Rational People Think at the Margin
The examples that I read in Chapter 1 such as airlines and cell phone companies made sense to me, and the marginal decision making that companies use to make a profit and sell their product and or services. 

What new questions do you have now about the US economy based on this chapter?

I am interested in learning more about the US governments role in the economy. 
What does the government do help boost the economy?
What government programs effect the economy? 
What do economists think about the role the government plays/effects of economy?