What would happen to your demand for ice cream if you lost your job one summer? Most likely, it would fall. A lower income means that you have less to spend in total, so you would have to spend less on some and probably most goods. If the demand for a good falls when income falls, the good is called a normal good.
Not all goods are normal goods. If the demand for a good rises when income falls, the good is called an inferior good. An example of an inferior good might be bus rides. As your income falls, you are less likely to buy a car or take a cab and more likely to ride a bus.
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