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Changes in Macroeconomic Activity The Business Cycle • The phases of the business cycle are: • • • • Recovery or Expansion, Peak or Boom (shaded green) Recession or Contraction trough or Depression (blue shaded areas). Real GDP Business peak Trend line Business peak Depression or trough Depression or trough Time The Business Cycle • Cycles are irregular •Annual growth rate of real GDP •8 •Long-run growth rate (approx. 3%) •6 •4 •2 •0 •- 2 •1960 •1965 •1970 •1975 •1980 •1985 •1990 •1995 •2000 •2005 •2009 •Source: Economic Report of the President, various issues. • Ups and downs characterize business activity. • There has been an upward trend in real GDP in the United States and other industrial nations. Changes in Total (Aggregate) Spending in the Economy, cause changes in total (aggregate) production and employment 1. 2. 3. 4. Households Businesses The Government Foreigners Goods and Services Markets Payments $$ •Simple Case: all output is purchased by the household Businesses •Nothing left for businesses, government or foreigners Resource Markets Resources Households 1. Spend their earned income 2. Biggest spenders (7.1 of 10.2 trillion) 3. Expansion 4. Contraction a. Increased spending a. Decreased spending b. larger output b. smaller output c. increased employment c. decreased employment d. more income d. less income •Next Case: households save some of their income, output is left over •Businesses purchase left over output, government or foreigners still get none Another Circular Flow 1. Investment spending 2. Borrow to buy capital replace old and new machinery 3. Reasons to buy or invest a. expected profits b. economic activity c. lower interest rates •Next Case: not all output is purchased by the household or businesses •something left for government or foreigners 1. Second largest spender 2. Purchases goods and services 3. provides transfers No goods or services received Another Circular Flow •Final Case: all output is not purchased domestically •Something left for foreigners 1. Exports Foreign purchases of US goods and services 2. Imports US purchases of Foreign goods and services Another Circular Flow From the Circular Flow: 1. Savings – consumers not spending 2. Taxes - money not able to spend 3. Imports - money sent abroad From the Circular Flow: 1. Investments –spending from Business 2. Government transfers - money not earned by Households 3. Exports - money from abroad The Multiplier • The Multiplier: A change in an injection (e.g. investment) leads to an even larger change in output and employment. • An injection comes from outside of the circular flow. (non-household) • Once it enters, the dollars are spent over and over. • The multiplier is the number by which the change in spending is multiplied to obtain the total increase. • The size of the multiplier depends on how much is spent of each increase. • The greater this %, the greater the effect The Multiplier • Remember: • injections will increase the size of the multiplier; • leakages will decrease the size of the multiplier, The Multiplier Principle Expenditure stage Additional income Additional consumption Marginal propensity to consume (dollars) (dollars) Round 1 Round 2 Round 3 Round 4 Round 5 All others 1,000,000 750,000 562,500 421,875 316,406 949,219 750,000 562,500 3/4 3/4 421,875 316,406 237,305 711,914 3/4 3/4 3/4 3/4 Total 4,000,000 3,000,000 3/4 For simplicity (here) it is assumed that all additions to income are either spent domestically or saved. • The multiplier concept is based upon the proportion of additional income that households choose to spend (here assumed to be 75% = 3/4). • Here, a $1,000,000 injection is spent, received as payment, saved and spent, received as payment, saved and spent … etc. … until … effectively, $4 million is spent in the economy. Assume the people will spend .8 (80%) of a change in their income and the change in business investment is $10 (billion). Complete the table below. How much will they save? ______ change in income change in consumption change in savings + $10 8 2 2nd round 8 6.4 1.6 3rd round 6.4 5.1 1.3 4th round 5.1 4.1 1 5th round 4.1 3.3 .8 16.38 13.10 3.28 50 40 10 increase in invest-ment of $10 billion all other rounds Totals Higher Spending Means a Larger Multiplier MPC Size of multiplier 9/10 4/5 3/4 2/3 1/2 1/3 10.0 5.0 4.0 3.0 2.0 1.5 • As the spending % increases more and more money of every injection is spent (and so received as payment and then spent again, received as payment and spent again, etc.). • The effect is that for higher spending, higher multipliers result, specifically the relationship follows this equation: 1 M = 1 - %spent Calculating the effect of the multiplier: change in the injection % not spent (saved) Change in investment % saved multiplier effect $10 20% ________ $10 10% ________ $10 25% ________ $20 20% ________ •The phase of the business cycle where real GDP, or output, reaches its maximum is the: •a. limit •b. trough •c. peak •d. expansion •Money received by a household from the government for which there is no work directly performed in return is: •a. a surtax •b. a payment-in-kind. •c. a transfer payment. •d. an income tax refund. •Which of the following is a leakage from the spending stream by households? •a. saving •b. a decrease in earned income. •c. the receipt of transfer payments. •d. borrowing from financial institutions. •A decrease in interest rates would •a. have no effect on investment decisions •b. make investment projects less attractive. •c. make more investment projects attractive •d. make investment spending as stable as personal consumption expenditures. The 2 main categories of government expenditures are: a. defense expenditures and tax refunds b. purchases of goods and purchases of services c. purchases of goods and services and transfer payments d. income determined and non-income-determined spending. The multiplier effect is the change in: a. income-determined spending generated by a change in total output. b. total output generated by a change in income-determined spending. c. total output generated by a change in non-income-determined spending. d. non-income-determined spending generated by a change in total output