Lesson 4: Liquidity and Why Size Moves Markets. Deep books absorb orders without flinching. Thin books do not.
You dump a giant buy order into a tiny, barely-traded stock. What happens to its price?
Gut check before we measure market depth.
Assessment
You place a buy order far bigger than usual in a small stock that rarely trades. What happens to its price as your order fills?
Big order, tiny stock 📈 Call it.