Key Idea: Topic 2.2 explains **what supply is**, why the supply curve slopes upward, what **shifts** it, and how to tell a **supply shift from a demand shift** in exam questions.
✅ Core definitions
📈 Why supply slopes upward
🔄 Non-price determinants (shift the curve)
⚡ Movements vs shifts
In an exam scenario: ask 'did PRICE change or did something ELSE change?' Price → movement. Anything else → shift.