- How Bid Ask Spread and Size Relate to Liquidity
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Understanding the Bid Ask Spread
- The Bid is the price where you can sell something
- The Ask is the price where you can buy something
The bid will always be displayed on the left and the ask will always be displayed on the right:
This means that someone is willing to pay $1.00 for a security and someone is attempting to sell the security for $1.10.
Understanding the Quoted Size
2 x 7
For options, the size represents the number of contracts. Here a size of 2 represents 2 option contracts.
20 x 50
Here someone is willing to buy 20 contacts for $1.50 per contract and some is willing to sell 50 contracts for $1.55 per contract.
How Bid Ask Spread and Size Relate to Liquidity
Bid 2.10 x 2.15 Ask
Size 435 x 650 Size
In this example it bid ask spread is tight (very close together) and there is a large amount of size on both sides of the market. Something that has good liquidity (is liquid) will always have a narrow bid ask spread and a large number of contracts on both the bid and the ask.
Bid 1.50 x 2.10 Ask
Size 4 x 9 Size
In this example the bid ask spread is very wide and there aren't very many contracts on either side of the market. Markets that have bad liquidity are not ideal to trade in.
As a whole you want to trade in markets with good liquidity that offers the trader the ability to get in and out of trades when you want or need to.