What Shifts the Demand Curve?

What are the factors that cause the demand curve to shift to the left or to the right? What does it mean when demand shifts?
An increase in demand means an increase in the quantity demanded at every price. Similarly, a decrease in demand means a decrease in the quantity demanded at every price.
This video looks at real-world examples of some important demand shifters, such as changes in income (both for normal and inferior goods), population, tastes, the price of related goods (both for substitutes and complements), and expectations.
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00:00 - Intro
00:23 - Increase in Demand
01:39 - Decrease in Demand
02:16 - 5 Demand Shifters
02:56 - Income: Normal Goods
03:34 - Income: Inferior Goods
04:06 - Population
04:45 - Tastes
05:33 - Related Goods: Substitutes
06:48 - Related Goods: Complements
07:55 - Expectations
09:00 - Next Steps

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Interesting that you (supposedly) watched this video and still don't understand how the principle of supply and demand works. If the price of things goes up by, let's say, the Fed making it more expensive to borrow money, demand decreases. Lower demand means lower prices. Hence, by cooling demand, the Fed counters inflation.

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