Chapter 14 Student Slides

Introduction to Aggregate Demand and Supply

  • Concept of Economics in Daily Life

    • Everyday transactions contribute to the Aggregate Demand (AD) in the economy.

    • Factors like fuel prices can influence supply quantities.

Key Learning Objectives

  • Understanding the derivation of Aggregate Demand from the Aggregate Expenditure model.

  • Identifying factors that cause changes in Aggregate Demand and Aggregate Supply.

  • Determining how AD and AS establish an economy’s equilibrium price level and real GDP.

  • Analyzing periods of demand-pull inflation, cost-push inflation, and recession using the AD-AS Model.

  • Exploring the Investment-Savings (IS) schedule and Liquidity-Money (LM) schedule.

Deriving the Aggregate Demand Curve

  • Price Level and Measurements

    • The AD curve relates the price level to the quantity of goods produced (real GDP).

    • As price levels increase, the quantity of real GDP often declines due to diminishing expenditure.

  • Visual Representation

    • Graphical representation with Aggregate Expenditures illustrated at different price levels reveals shifts in the AD curve.

    • Initial changes in Aggregate Expenditures can lead to a multiple shift in Aggregate Demand.

AD-AS Model Overview

  • Understanding the AD-AS Model

    • The model combines Aggregate Demand and Aggregate Supply.

    • The downward slope of the AD curve can be attributed to:

      • Real-Balances Effect: Higher prices reduce the purchasing power of money, leading to lower demand.

      • Interest-Rate Effect: Higher price levels can lead to increased interest rates, reducing investment and consumption.

      • Foreign Purchases Effect: Increased domestic prices can deter exports and encourage imports, reducing overall demand.

Factors Changing Aggregate Demand

  • Determinants of Aggregate Demand

    • Changes in consumer spending habits, consumer wealth, expectations, household debt, personal taxes.

    • Fluctuations in investment spending and real interest rates.

    • External factors such as government spending, net exports, foreign income, and exchange rates.

Understanding Aggregate Supply

  • Key Concepts in Aggregate Supply

    • Long-Run Aggregate Supply (ASLR): Represents production capacity when all resources are used efficiently.

    • Short-Run Aggregate Supply: Influenced by per-unit production costs and input prices.

  • Changes in Aggregate Supply

    • Determined by input prices, domestic resource prices, productivity changes, market power, and regulatory environment.

Equilibrium and Its Changes

  • Finding Equilibrium

    • The intersection of AD and AS curves denotes the equilibrium price level and real output.

    • Economic shifts lead to increases or decreases in aggregate demand, causing changes in equilibrium.

  • Inflation and Recession Analysis

    • Demand-Pull Inflation can occur with increased aggregate demand.

    • A decrease in aggregate demand may trigger recessionary conditions.

    • Cost-Push Inflation results from rising supply costs affecting market equilibrium.

IS and LM Curves

  • Deriving the IS Curve

    • The IS curve represents equilibrium in the goods market where total spending equals total output.

  • LM Curve in Money Market

    • Illustrates the relationship between real money balances, interest rates, and the level of real GDP.

Summary of Key Terms

  • Key Economic Terms:

    • Aggregate Demand (AD), Aggregate Supply (AS), Real-Balances Effect, Interest-Rate Effect, Foreign Purchases Effect, Fiscal Policy, Monetary Policy, Long-Run Aggregate Supply, Short-Run Aggregate Supply, Determinants of Aggregate Demand/Supply, Productivity, Equilibrium Price Level, Menu Costs, Efficiency Wages, Interest Rates, Investment-Savings Schedule, Liquidity and Money Schedule.