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Orders, Execution & Market Structure

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Orders, Execution & Market Structure

Market Depth

The quantity of shares available at each price level on both sides of the order book.

Depth at a level = total quantity of resting orders at that price on the relevant side shares
Orders, Execution & Market Structure

Market Maker

A participant that continuously quotes both a bid and an ask, standing ready to buy or sell and earning the spread.

Gross Earnings = Bid-Ask Spread x Volume Transacted, less losses from adverse price moves on inventory
Orders, Execution & Market Structure

Market Order

An instruction to buy or sell immediately at the best price currently available in the order book.

Test: the order specifies quantity but no price, and executes against resting orders until filled qualitative