1.3.2.5d - Factors affecting YED

Explain factors that influence income elasticity of demand.

Use d - factors affecting yed to connect the rule to the data and decision in the question.

This matters because d - factors affecting yed determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply d - factors affecting yed to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: d - Factors affecting YED is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.