Answer:
The income effect
Step-by-step explanation:
The income effect is the effect on real income when price changes and it can be positive or negative. for instance when price falls, and assuming nominal income is constant, the same nominal income can buy more of the good hence demand for this and other goods is likely to rise.
Madeleine's vacation time has been spent at home catching a few local attractions when she could afford them. This year, she received a big bonus at work and has decided to finally take the trip to Europe that she has always dreamed about. Madeleine's purchasing behavior has changed due to the income effect.
This explains the concept of income effect.