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if you look at the DOM (depth of market) for any security (a ladder of prices, with bids on the left and offer on the right)...the distance in price between the highest bid, and the lowest offer is the "market bid/ask spread". For example, looking at crude oil futures, the bid/ask spread is typically very tight and keeps the minimum for that market of 1 cent. However, in securities that are not super liquid and don't have lots of trading activity (most stocks, and a few commodities), the bid/ask spread can be much wider (and changes as market volatility changes)...so there is no set rule, other than the minimum increment set by the exchange.

https://d12pmmbqk6r2v2.cloudfront.net/assets/images/pages/lg/TT16_05_31…" alt="crude oil DOM" title="crude oil DOM" />

Then we get to the off screen institutions trading (most all securities can trade "off screen" for sufficiently large size...this is mostly how customers trade with the dealer banks)...if you look closely at the DOM, you will see the actual volumes on the bid and offer are small...but what if you are in the dealer seat at GS, and a customer asks you to bid on 5000 contracts (and the market bid/ask market is 30 contracts at 35 contracts with a 1 cent bid/ask spread...which you will need to use to get out of the position)? Would you show that same tight market for such a large size? No, you would normally back off the market price and show something with a little more room. In this case, you would probably bid 5-10 cents below the market bid for 5k contracts. Otherwise, how do you plan to get out of the position without losing money? You generally assume that your customers trading large size are going to be correct (they usually are in the short term), and so you want to get out as soon as possible. THIS is the job of being an institutional market maker...determining how aggressive you can be in quoting a bid/ask spread for large size without losing money.

just google it...you're welcome

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