Engel curve
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In economics, an Engel curve shows how the demand for a good or service changes as the consumers income level changes. It is named after the 19th century German statistician Ernst Engel.
Graphically, the Engel curve is represented in the first-quadrant of the cartesian coordinate system. Income is shown on the Y-axis and the quantity demanded for the selected good or service is shown on the X-axis.
For normal goods, the Engel curve has a positive slope. That is, as income increases, the quantity demanded increases. For inferior goods, the Engel curve has a negative slope. That means that as the consumer has more income, they will stop buying the inferior goods because they are able to purchase better goods.