-Income
-Price of Complements
-Price of Substitutes
-Tastes and Fashion
Because of diminishing returns to the variable factor.
"Too many cooks spoil the broth"
As you increase output (in the short run) workers get in each other's way and become less productive, increasing the cost of producing the next unit.
Elastic
Demand curve shifts left
Goods that can be used as a replacement for each other because they serve the same purpose
e.g. Coke and Pepsi
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