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'''Intermediate''': 3. Draw the supply and demand for air. In addition, draw the supply and demand for a good that costs $10000000000000000000000000 trillion dollars.
'''Intermediate''': 3. Draw the supply and demand for air. In addition, draw the supply and demand for a good that costs $10000000000000000000000000 trillion dollars.
'''The demand curve for air must be at a zero price, which is the x-axis (P=0 everywhere). The supply curve for air must be at fixed quantity, and hence a vertical line. They must intersect at P=0, Q=amount of air in the atmosphere:'''
'''The demand curve for air must be at a zero price, which is the x-axis (P=0 everywhere, although note that if the quantity of air ever approached zero then the demand price would sharply increase as people would pay to survive). The supply curve for air must be at fixed quantity, and hence a vertical line. They must intersect at P=0, Q=amount of air in the atmosphere:'''
[[Image:Air supply and demand.jpg]]
[[Image:Air supply and demand.jpg]]