There’s a few things wrong with this: 1. For anything remotely liquid, the order book won’t look like this for various reasons. 2. Except at very high frequenc

There’s a few things wrong with this: 1. For anything remotely liquid, the order book won’t look like this for various reasons. 2. Except at very high frequency time scales there are more robust measures of price that are typically used: e.g. VWAP over some interval (this would be ~$10 in your example), or the clearing price of the closing auction, etc