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ECON College Notes
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Economics college class notes are comprehensive collections of information and concepts covered in undergraduate-level economics courses. These notes serve as study aids, summarizing lectures, textbook readings, and applied examples. They are divided into two main branches: microeconomics and macro...

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  • November 20, 2024
  • 1
  • 2024/2025
  • Class notes
  • Colleen carey
  • All classes

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Microeconomics
1. Supply and Demand

A. Law of Demand

● Definition: Inverse relationship between price and quantity demanded (ceteris paribus).
1. As price decreases, demand increases.
2. Demand curve slopes downward.
● Key Factors Influencing Demand:
1. Income (normal vs. inferior goods).
2. Price of substitutes/complements.
3. Consumer preferences.
4. Expectations of future prices.
5. Population demographics.

B. Law of Supply

● Definition: Direct relationship between price and quantity supplied (ceteris paribus).
1. As price increases, supply increases.
2. Supply curve slopes upward.
● Key Determinants of Supply:
1. Input prices (labor, raw materials).
2. Technology advancements.
3. Taxes and subsidies.
4. Number of suppliers.
5. Expectations of future prices.

C. Market Equilibrium

● Equilibrium Price (P*): Price at which quantity supplied equals quantity demanded.
● Shifts in Curves:
○ Demand Increase: Higher equilibrium price and quantity.
○ Supply Increase: Lower equilibrium price, higher quantity.

D. Elasticity

1. Price Elasticity of Demand (PED):
○ Formula: PED=%ΔQd%ΔPPED = \frac{\% \Delta Q_d}{\% \Delta P}PED=%ΔP%ΔQd​​
○ Elastic if PED > 1, inelastic if PED < 1.
○ Determinants: Availability of substitutes, necessity vs. luxury, time horizon.
2. Price Elasticity of Supply (PES):
○ Formula: PES=%ΔQs%ΔPPES = \frac{\% \Delta Q_s}{\% \Delta P}PES=%ΔP%ΔQs​​
○ Influenced by production flexibility and time.

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