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Even if you have the formula booklet, the IB awards "method marks." If your final answer is wrong but your process (using the correct formula) is right, you still get points.

When performing calculations, always include the units (e.g., millions of USD, percentage, or units of output).

During your two-year course, write notes next to the formulas explaining what each variable means.

Practice Paper 3 questions specifically. This builds the "muscle memory" needed to find the right formula quickly under exam pressure. Conclusion

Crucial for identifying normal vs. inferior goods.

A favorite for Paper 3. You must know how to calculate it using the Marginal Propensity to Consume (MPC) or the leakages (