You've probably heard the terms spread or bid and ask before but you may not know what they mean or how they relate to the stock market. The bid-ask spread can affect the price at which a purchase or sale is made - and an investor's overall portfolio return. What this means is that if you want to dabble in the equities markets, you need to become familiar with this concept.
Supply and Demand
Investors must first understand the concept of supply and demand before learning the ins and outs of the spread. Supply refers to the volume or abundance of a particular item in the marketplace, such as the supply of stock for sale. Demand refers to an individual's willingness to pay a particular price for an item or stock. (For more insight, read Economics Basics: Demand and Supply.)
Example - How Supply and Demand Work Together
Suppose that a one-of-a-kind diamond is found in the remote countryside of Africa by a miner. An investor hears about the find, phones the miner and offers to buy the diamond for $1 million. The miner says she wants a day or two to think about it. In the interim, newspapers and other investors come forward and show their interest. With other investors apparently interested in the diamond, the miner holds out for $1.1 million and rejects the $1 million offer. Now suppose two more potential buyers make themselves known and submit bids for $1.2 million and $1.3 million dollars, respectively. The new asking price of that diamond is going to go up.
The following day, a miner in Asia uncovers 10 more diamonds exactly like the one found by the miner in Africa. As a result, both the price and demand for the African diamond will drop precipitously because of the sudden abundance of the once-rare diamond. This example - and the concept of supply and demand -can be applied to stocks as well.
The spread is the difference between the bid and ask for a particular security.
Example - The Bid-Ask Spread
Let's assume that Morgan Stanley Capital International (MSCI) wants to purchase 1,000 shares of XYZ stock at $10, and Merrill Lynch & Co. wants to sell 1,500 shares at $10.25. The spread is the difference between the asking price of $10.25 and the bid price $10, or $0.25.
An individual investor looking at this spread would then know that if he wants to sell 1,000 shares, he could do so at $10 by selling to MSCI. Conversely, the same investor would know that he could purchase 1,500 shares from Merrill Lynch at $10.25.
The size of the spread and the price of the stock is determined by supply and demand. The more individual investors or companies that want to buy, the more bids there will be; more sellers results in more offers or asks.
On the New York Stock Exchange (NYSE) a buyer and seller may be matched by computer. However, in some instances, a specialist who handles the stock in question will match buyers and sellers on the floor of the exchange. In the absence of buyers and sellers, this person will also post bids or offers for the stock in order to maintain an orderly market. (For related reading, see Understanding Order Execution.)
On the Nasdaq, a market maker will use a computer system to post bids and offers and essentially plays the same role as a specialist. However, there is not a physical floor. All orders are marked electronically.
It is important to note that when a firm posts a top bid or ask and is hit by an order, it must abide by its posting. In other words, in the example above, if MSCI posts the highest bid for 1,000 shares of stock and a seller places an order to sell 1,000 shares to the company, MSCI must honor its bid. The same is true for ask prices.
Types of Orders
There are five types of orders that an individual can place with a specialist or market maker:
The bid-ask spread is essentially a negotiation in progress. In order to be successful, traders must be willing to take a stand and walk away in the bid-ask process through limit orders. By executing a market order without concern for the bid-ask and without insisting on a limit, traders are essentially confirming another trader's bid, creating a return for that trader.
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