| Concept | Official Formula | Repack Strategy (The "Cheat Code") | | :--- | :--- | :--- | | | (%ΔQd)/(%ΔP) | Remember: Always report absolute value (drop -). | | YED | (%ΔQd)/(%ΔY) | Sign matters: + = Normal good; - = Inferior. | | XED | (%ΔQd Good A)/(%ΔP Good B) | + = Substitutes; - = Complements. | | PES | (%ΔQs)/(%ΔP) | Flows from zero to infinity. | | Tax Revenue | Tax per unit × Quantity after tax | Draw the wedge. Area of rectangle under DWL. | | Consumer Surplus (CS) | ½ × Base × Height (demand curve to price) | After tax, CS shrinks to the triangle left of Qty new. | | Producer Surplus (PS) | ½ × Base × Height (price to supply curve) | After tax, PS shrinks. | | DWL (Tax) | ½ × (Tax per unit) × (ΔQuantity) | The deadweight loss triangle. | | Price Ceiling Shortage | Qty demanded – Qty supplied (at ceiling price) | Calculate using the linear functions. |
This is where the concept of the comes in. A repack isn't just a copy of the original; it is a strategic reorganization of every elasticity, multiplier, tax incidence, and terms of trade formula into a battle-ready cheat sheet. ib economics hl formula booklet repack
If you are an IB Diploma student walking into the Economics Higher Level (HL) paper, you know the drill. You have exactly 75 minutes for Paper 1, 90 minutes for Paper 2, and a grueling 1 hour and 45 minutes for Paper 3—the quantitative paper. In Paper 3, you are allowed one critical tool: the IB Economics HL formula booklet . | Concept | Official Formula | Repack Strategy
But let’s be honest. The official booklet provided by the IBO is cluttered, disorganized, and overwhelming. It contains formulas from all four sections of the course (Micro, Macro, International, and Development), but they are listed in a linear, text-heavy format that slows you down. | | PES | (%ΔQs)/(%ΔP) | Flows from zero to infinity