There is a difference between demand and quantity demanded! It is possible for your demand to remain constant, while your quantity demanded fluctuates. It's also possible for the price of a good to remain constant, yet you want more or less of it.
Things that impact your quantity demanded:
- Income changes
- Prices of other things change
- Expectations change
- Tastes change
- Number of participants in the market change
Normal Goods: when income increases, your quantity demanded also increases --> you buy more or better quality versions of these goods
Inferior Goods: when your income increases, your quantity demanded decreases
Substitute Goods: when the price of substitute goods increase, your demand for the original good increases
Complementary Goods: if the price of complementary goods goes up, the demand for the paired goods goes down --> treat these goods as the original good
Expectations: expectations about the future price of goods affect how much you consume. Also, expectations about the price of substitutes affect how much you consume.
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