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Marymount UniversityMacroeconomics
Key formulas and definitions for the Macroeconomics exam
Typology: Cheat Sheet
2019/2020
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Uploaded on 10/09/2020
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Download AP Macroeconomics Formulas and Definitions Cheat Sheet and more Cheat Sheet Macroeconomics in PDF only on Docsity! AP Macroeconomics Formula Sheet: AP Macroeconomics Formulas and Definitions: Key Formulas 1. Rule of 70: Used to determine how many years it takes for a value to double, given a particular annual growth rate. For example, if you put $20,000 in the bank and it earns yearly interest of 7%, then it will take 10 years (70/7) for your income to double. 70/x = # years to double where x equals growth rate. 2. Y = C + I + G + NX – the spending approach to calculating GDP. 3. S = I in a closed economy (no trade) and S = I + NX in an open economy 4. Calculating Nominal GDP: Multiple the number of each good produced times the price of each good: Photdog*Qhotdog + Phamburger*Qhamburger. 5. Calculating Real GDP: this proceeds just as calculating nominal GDP, but instead of current prices you use base prices: Photdog(base year)*Qhotdog (current year) + Phamburger (base year)*Qhamburger (current year). Side implications: In the base year Nominal GDP = Real GDP, with inflation Nominal GDP > Real GDP. 6. GDP deflator: A measure of the cost of living (substitute for the CPI). GDP deflator = (Nominal GDP/Real GDP)*100. Remember that this is an index. Side implication: In the base year the GDP Deflator = 100. 7. Constructing the CPI: step 1: compute the cost of a market basket in each year (prices times quantities), step 2: choose a base year. Step 3: Calculate the CPI for the current year by: (Cost current year)/(cost in base year)*100. Side implication: in the base year the CPI = 100. With inflation, CPI increases. 8. The inflation rate via the CPI: (CPI current year – CPI previous year)/CPI previous year all times 100. Note that this is just a percentage change. The inflation rate is the percentage change in the CPI from one period to the next. You could also calculate the percentage change in the GDP (implicit) price deflator from year to year to derive at an alternative measure of inflation. 9. Correcting for inflation: Let’s adjust for inflation so we can, in a more meaningful way, compare the dollar values of different points in time. Convert a figure in 1990 to its current value: current value = value in 1990 * (CPI in 2000/CPI in 1995). For example, Babe Ruth earned $80,000 in 1931. Translating to current dollars means: current value = 80,000 * (107.6/8.7) = $989,000. So $80,000 back then is equivalent to $989,000 today…THIS ONE IS CRUCIAL!!!!!! 10. Real interest rate = nominal interest rate – inflation rate. 11. Production function: Y = AF(L,K,H,N) 12. Productivity: Y/L = AF(1,K/L, H/L, N/L) 13. Unemployment Rate = (Number of Unemployed/Labor Force)*100. Key, first http://www.runningromans.com/Academics/Econom...view%20Notes/Formulas%20and%20Definitions.htm (1 of 6) [3/19/2011 7:58:36 AM] AP Macroeconomics Formula Sheet: get the labor force – all the folks who are actively seeking employment! 14. Labor force participation rate: (Labor force/adult population)*100. 15. Money Multiplier = 1/R where R = reserve ratio. Application: an initial injection of $1000 of new money into an economy with a reserve ratio of 10% (.1) will generate $1000*(10) = $10,000 in total money. 16. Quantity equation of money: MV = PY – a moneterist’s view of what explains changes in P (they are correct, in the long run changes in P is driven by changes in M because V is stable and Y is determined outside the model). If given three of the four variables, you should be able to use this equation to find the unknown variable. 17. MPC + MPS = 1. Know these definitions and this property! 18. Expenditures Multiplier = 1/(1 – MPC) OR 1/MPS. It tells you how much total spending an initial injection of spending in the economy will generate. For example, if the MPC = .8 and the government spends $100 million, then the total increase in spending in the economy = $100 * 5 = 500 million. Key Definitions: 1. Aggregate demand: A schedule or curve which shows the total quantity of goods and services demanded (purchased) at different price levels. 2. Aggregate supply: the total amount spent for final goods and services in the economy. 3. Absolute advantage: the comparison among producers of a good according to their productivity (NOT their opportunity costs). 4. Allocative efficiency: the apportionment of resources among firms and industries to obtain the production of the products most wanted by society (consumers); the output of each product at which its marginal cost and price (marginal benefit) are equal. 5. Automatic stabilizers: changes in fiscal policy that stimulate AD when the economy goes into a rece4ssion without policymakers having to take any deliberate action. 6. Business cycle: recurrent ups and downs over a period of years in the level of economic activity. 7. Capital: human-made resources (machinery and equipment) used to produce goods and services; goods which do not directly satisfy human wants. 8. Catch up effect: the property whereby countries that start off poor tend to grow more rapidly than countries that start off rich. 9. Ceteris paribus: "other things equal" used as a reminder that all variables other than the ones being studied are assumed to be constant. 10. Circular flow diagram: a visual model of the economy that shows how dollars flow through markets among households and firms. 11. Classical dichotomy: the theoretical separation of nominal and real variables. 12. Comparative advantage: a lower relative cost than another producer. 13. CPI: an index which measures the prices of a fixed market basked of consumer goods http://www.runningromans.com/Academics/Econom...view%20Notes/Formulas%20and%20Definitions.htm (2 of 6) [3/19/2011 7:58:36 AM] AP Macroeconomics Formula Sheet: benefits and marginal costs. 55. Marginal propensity to consume (MPC): fraction of any change in income spent for goods and services; equal to the change in consumption divided by the change in disposable income. 56. Marginal propensity to save (MPS): fraction of any change in income that is saved; equal to the change in savings divided by the change in disposable income. 57. Menu costs: the costs of changing prices 58. Microeconomics: the part of economics concerned with such individual units within the economy as Industries, firms, and households; and with individual markets, particular prices, and specific goods and services. 59. Monetary neutrality: the proposition that changes in the money supply do not affect real variables 60. Moneterism: the macroeconomic view that the main cause of changes in aggregate output and the price level are fluctuations in the money supply; advocates a monetary rule. 61. Monetary policy: changing the money supply to assist the economy to achieve a full employment, noninflationary level of total output. 62. Money: any item which is generally acceptable to sellers in exchange for goods and services. 63. Natural rate hypothesis: the idea that the economy is stable in the long run at the natural rate of unemployment; views the long run Philips curve as vertical at the natural rate of unemployment. 64. Normative economics: that part of economics pertaining to value judgements about what the economy should be like; concerned with economic goals and policies. 65. Okun’s law: the generalization that any one percentage point rise in the unemployment rate above the full employment unemployment rate will increase the GDP gap by 2.5 percent of the potential GDP of the economy. So…start in long run equilibrium – as the unemployment rate increases by 1% we see GDP growth decrease by 2.5 percent. 66. Opportunity cost: the amount of other products which must be forgone or sacrificed to produce a unit of a product. 67. Philips curve: a curve showing the relationship between the unemployment rate and the inflation rate. In the short run it shows a negative (inverse) relationship. In the long run there is no relationship. 68. Positive economics: the analysis of facts or data to establish scientific generalizations about economic behavior (as opposed to normative economics). 69. Potential GDP: the real output an economy is able to produce when it fully employs its available resources. 70. Production possibilities frontier: a graph that shows the various combinations of output that the economy can possibly produce given the available factors of production and the available production technology. 71. Productive efficiency: the production of a good in the least costly way (minimum http://www.runningromans.com/Academics/Econom...view%20Notes/Formulas%20and%20Definitions.htm (5 of 6) [3/19/2011 7:58:36 AM] AP Macroeconomics Formula Sheet: ATC) 72. Rational expectations theory: the hypothesis that business firms and households expect monetary and fiscal policies to have certain effects on the economy and take, in pursuit of their own self interests, actions which make these policies ineffective. 73. Ricardian equivalence theorm: the idea that an increase in the public debt will have little or no effect on real output and employment because taxpayers will save more in anticipation of future higher taxes to pay the higher interest expense on the debt. Meant to show fiscal policy is ineffective: I won’t consume more when you lower my taxes because I know you are going to raise them in the future… 74. Say’s Law: the macroeconomic generalization that the production of goods and services (supply) creates an equal aggregate demand for these goods and services. The implication is that we can never have a recession due to a shortfall in AD (this law was shown to be false!) 75. Shoeleather costs: the resources wasted when inflation encourages people to reduce their money holdings and make trips to the bank more frequently. 76. Stagflation: inflation accompanied by stagnation in the rate of growth of output and a high unemployment rate in the economy. Caused by a decrease in AS. 77. Structural unemployment: unemployment caused by changes in the structure of demand for goods and in technology; workers who are unemployed because their skills are not demanded by employers, they lack sufficient skills to obtain employment, or they cannot easily move to locations where jobs are available. 78. Terms of trade: the rate at which units of one product can be exchanged for units of another product; the amount of one good or service given up to obtain one unit of another good or service. http://www.runningromans.com/Academics/Econom...view%20Notes/Formulas%20and%20Definitions.htm (6 of 6) [3/19/2011 7:58:36 AM]
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