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ECON 101 — Ch. 4 Supply & Demand.pdf
Scene 6 of 10
Where the two curves cross is the equilibrium — the one price where what buyers want matches what sellers make.
0:00 / 8:40
What you get
It draws, not slides
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It works the problems
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How it works
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The key ideas get pulled out and turned into short scenes, in plain English.
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Each idea gets drawn out while it's explained. Skip around, rewatch the confusing parts.
Examples
A real page from an econ problem set, and the scene it turned into.
What you upload
Use these functions throughout unless a question says otherwise. Market demand: Qd = 120 - 2P Market supply: Qs = 3P - 30 P is the price in dollars, Q is quantity in units. Question 1. Find the equilibrium price and the equilibrium quantity. Show that quantity demanded equals quantity supplied at that price.
What you get back
A market settles down at the one price where what buyers want to buy exactly matches what sellers want to sell. Anywhere else, either shoppers are fighting over scarce goods or shopkeepers are stuck with unsold stock, and that pressure pushes the price back toward balance. Here that balance happens at a price of 30 dollars, where both sides agree on a quantity of 60 units.
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