3. (5 points) As the U.S. economy opens up and more people get vaccinated, more and more people are travelling within the country. (a) Please explain what will happen to the demand and supply curves for air travel within the United States. If you say demand (or supply) will change, you must explain why it will change. (b) Based on your answer to (a) what do you think will happen to the equilibrium price of air travel? Please give an explanation