The mathematical sign indicates the relationship between goods. Positive (+) XEDPositive (+) XED : Substitutes (e.g., Pepsi and Coca-Cola) Negative (-) XEDNegative (-) XED : Complements (e.g., Printers and Ink cartridges) Zero (0) XEDZero (0) XED : Unrelated independent goods Income Elasticity of Demand (YED) Formula: is Income) Interpretation: Positive (+) YEDPositive (+) YED : Normal good ( is a luxury; is a necessity). Negative (-) YEDNegative (-) YED : Inferior good (demand drops as income increases). Price Elasticity of Supply (PES) Formula: Interpretation: Always positive due to the Law of Supply. : Elastic supply : Inelastic supply Government Interventions and Market Welfare
: Provides a free IBDP Economics Formula Sheet specifically for 2024-2026 syllabus updates.
To succeed in Paper 3, focus on these core mathematical concepts derived from current study guides and resources: Linear Functions : Demand ( ) and Supply ( ib economics hl formula booklet
Write a "cheat sheet" of what is not in the booklet. For example:
The is a vital tool, but it works best in the hands of a prepared student. By understanding the core concepts behind the formulas, practicing with past paper questions, and knowing where to look in the booklet, you can approach the quantitative section of the IB Economics exam with confidence. For example: The is a vital tool, but
It often lists formulas without defining what the symbols mean.
: Channels like EconplusDal have dedicated videos walking through every equation needed for Paper 3. IB Economics HL Formula Booklet | PDF - Scribd you are expected to understand
Because you cannot rely on an official booklet, you must internalize the formulas. Think of this guide as the blueprint for building your own "mental" (and physical revision) formula booklet—a comprehensive collection of every calculation you need to memorize for the exam. As a core part of your HL studies, you are expected to understand, apply, and manipulate these formulas independently.
\textTOT = (\textIndex of P_x \, / \, \textIndex of P_m) \times 100 6. High-Yield Paper 3 Exam Strategies
In Paper 3, the IB often awards "method marks." Even if your final answer is slightly off due to a calculator error, showing the formula and your substitution can save your grade.