Quote from uninvited_guest:
I assume that you asked this question because there has to be a buyer and a seller to complete transaction, and why would the price go up or down. I will give a simple example:
There are two cars in lot, both selling for $5000.00 owner must sell that day. Three outcomes to set the selling price.
#1 Along comes 1 buyer, he can get both cars for $3000.00 each.
#2 Along comes 2 buyers, both buy for $5000.00 each
#3 Along comes 3 buyers, only 2 can buy for $7,000.00 each.
In all transactions 2 cars were sold but the price was determined by the number of buyers.