Use the following to answer question: 
-(Figure: Gain in Consumer Surplus) Look at the figure Gain in Consumer Surplus.Identify the area or areas that represent the gain in consumer surplus to consumers already participating in the market when the price falls from P1 to P2.
Definitions:
English Auction
A common type of auction where participants openly bid against one another, with the price gradually increasing until only the highest bidder remains.
Rational Self-Interest
The principle that individuals tend to make decisions that they perceive to be the best for their own welfare and success.
Collude
A secret or illegal cooperation or conspiracy, especially between parties to deceive or defraud others.
Reserve Price
A reserve price is the minimum price a seller is willing to accept for an item at auction; if bids do not reach this price, the item is not sold.
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