2.5 Elasticities of demand
2.5.2—Price elasticity of demand
2.5.3—PED diagrams and revenue
2.5.4 (HL)—PED along a straight-line demand curve
2.5.5—Determinants and importance of PED
2.5.6 (HL)—PED for primary commodities
2.5.7—Income elasticity of demand
2.5.8 (HL)—Importance of YED
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