Ceteris Paribus?

Except for Giffen goods, I do not think there could be upward-sloping demand curves. The other examples are noy holding othet things constant and confusing the increase in demand with increase in quantity demanded. We know that a change in expectations shift the demand curve. If this leads to an increase in demand, prices go up and quantity traded increases. The end result is a spurious positive correlation between price increase and more purchases. Please read the above examples again with this in mind.

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