How do I calculate producer and consumer surplus from this information? :
In June 2008, the U.S. retail gas price jumped from $3 to $4 a gallon.
This is a 33% increase in price from January 2008.
During that time, the total quantity of gasoline purchased fell by 3%.
Supplies of gasoline produced also decreased from 1 million barrels to 800,000 barrels.
No viable substitute has been created to replace gasoline.