Customer 3 now wants to have some of the fun, and buys ad space in the
same column at the new price of $4. His / her ad is displayed at the
top.
Customer 1 and 2's ads are both moved down one space.
Customer 2 receives a refund of his /
her initial outlay of $2.
Customer 1 receives his / her initial
outlay of $1 again - and so doubles his / her money. As he / she has
now doubled their money, they will no longer receive any more refunds,
however their ad will still appear on the site, being moved down one
space everytime.
The price for the top ad space in the
column now doubles to $8.
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