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How to derive market information from listing prices only

Abbreviated Question: 
How to derive market information from listing prices only
Answer: 

The question you are asking is about the bid-ask spread.  The bid is what a buyer wants to pay for an item. The ask is what the seller wishes to receive.  You know the ask, you want to know the bid.  The bid would be demand, the ask would be supply (see, Ask an Economist any question and eventually you'll get "Supply & Demand" as an answer).  For example, a December gold futures contract today had a spread of about 20 cents per ounce.