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# YED | A-Level Economics Notes
- URL: https://www.a-level-economics-tutor.com/yed-notes/
- Published: 2026-02-12T15:36:04.000Z
- Updated: 2026-06-04T12:22:36.000Z
- Author: Jaisul Naik
- Tags: Y12 Microeconomics Notes

These revision notes cover everything you need to know about **YED** for A-Level Economics. They're designed for students studying AQA A-Level Economics, Edexcel A-Level Economics, and Edexcel International A-Level Economics. Written by Jaisul Naik, UCL Economics graduate and A-Level Economics tutor since 2017.

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### What is the formula for YED?

YED is % change in demand/ % change in income.

### What is the definition of YED?

YED is the responsiveness of demand to a change in income.

### What does it mean if YED is between 0 to 1?

YED is between 0 and 1 for normal goods.

For example, if income increased by 10%, demand for bread would not change too much.

### What does it mean if YED is more than 1?

YED is between more than 1 for luxury goods.

For example, if income increased by 10%, demand for private taxis would increase as consumers change their preferences.

### What does it mean if YED is less than 0?

YED is between less than 0 for inferior goods.

For example, if income increased by 10%, demand for bus fares would fall as consumers change their preferences.

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### Summary questions

1. What is the formula for YED?
2. What is the definition of YED?
3. What does it mean if YED is between 0 to 1?
4. What does it mean if YED is more than 1?
5. What does it mean if YED is less than 0?

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