The graph above, titled Nominal and Real GDP in the U.S., indicates that before 2009, the real GDP series in red was higher than the nominal GDP series in blue. This wedge between both historical series is due to: a) The quantities of goods and services included in the real series (ted) are higher than the corresponding quantities in the nominal series (blue). b) The prices used in the real series (red) before 2009 were higher than the corresponding prices in the nominal series (blue). c) The prices and quantities used in the real series (red) before 2009 were higher than the prices and quantities used in the nominal series (blue) d) The prices used in the real series (red) before 2009 were lower than the prices used in the nominal series (blue)