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Lecture No. 36 Chapter 11 Contemporary Engineering Economics Copyright © 2010 Contemporary Engineering Economics, 5th edition, © 2010
Equivalence Calculations under Inflation Contemporary Engineering Economics, 5th edition, © 2010 Types of Analysis Method Constant-Dollar AnalysisActual-Dollar Analysis Types of Cash Flows Estimated in Constant DollarsEstimated in Actual Dollars Types of Interest Rate Market Interest Rate (i)Inflation-free Interest Rate (i)
Inflation Terminology - III Inflation-free interest rate (i): an estimate of the true earning power of money when the inflation effects have been removed (also known as real interest rate). Market interest rate (i): an interest rate which takes into account the combined effects of the earning value of capital and any anticipated changes in purchasing power (also known as inflation-adjusted interest rate). Contemporary Engineering Economics, 5th edition, © 2010
Inflation and Cash Flow Analysis Contemporary Engineering Economics, 5th edition, © 2010 Constant Dollar analysis Estimate all future cash flows in constant dollars. Use i as an interest rate to find the equivalent worth. Actual Dollar Analysis Estimate all future cash flows in actual dollars. Use i as an interest rate to find the equivalent worth.
When do we Prefer Constant Dollar Analysis? In the absence of inflation, all economic analyses up to this point is, in fact, the constant dollar analysis. Constant dollar analysis is common in the evaluation of many long-term public projects, because governments do not pay income taxes. For private sector, income taxes are levied based on the taxable income in actual dollars, so the actual dollar analysis is more common. Contemporary Engineering Economics, 5th edition, © 2010
Two Alternate Ways in Conducting Actual Dollars Analysis Contemporary Engineering Economics, 5th edition, © 2010 Method 1: Deflation Method - Step 1:Bring all cash flows to have common purchasing power. - Step 2:Consider the earning power. Method 2: Adjusted-discount Method - Combine Steps 1 and 2 into one step.
Example 11.6 – Deflation Method Step 1: Converting Actual Dollars into Constant Dollars Step 2: Calculating Equivalent Present Worth Contemporary Engineering Economics, 5th edition, © 2010
Graphical Overview on Deflation Method (Example 11.6): Converting actual dollars to constant dollars and then to equivalent present worth Contemporary Engineering Economics, 5th edition, © $75,000$30,476 $32,381 $28,334$23,858 $45,455 -$75,000 $32,000 $35,700 $32,800 $29,000 $58,000 -$75,000 $27,706 $26,761 $21,288 $16,295 $28,218 $45,268 Actual Dollars Constant Dollars Present Worth n = 0 n = 1n = 2n = 3n = 4n = 5
Adjusted-Discount Method – Perform Deflation and Discounting in One Step Contemporary Engineering Economics, 5th edition, © 2010 Step 1 Step 2 o Discrete Compounding o Continuous Compounding
Example 11.7 Adjusted-Discounted Method Given: inflation-free interest rate = 0.10, general inflation rate = 5%, and cash flows in actual dollars Find: i and NPW Contemporary Engineering Economics, 5th edition, © 2010
Graphical Overview on Adjusted Discount Method: Converting actual dollars to present worth dollars by applying the market interest rate Contemporary Engineering Economics, 5th edition, © 2010 n = 0 n = 1n = 2n = 3n = 4n = 5 -$75,000 $32,000 $35,700 $32,800 $29,000 $58,000 Actual Dollars -$75,000 $27,706 $26,761 $21,288 $16,295 $28,218 $45,268 Present Worth
Contemporary Engineering Economics, 5th edition, © 2010 Mixed-Dollar Analysis – College Savings Plan Equivalence Calculation with Composite Cash Flow Elements Age (Current Age = 5 Years Old) Estimated College Expenses in Todays Dollars College Expenses Converted into Equivalent Actual Dollars 18 (Freshman)$30,000$30,000(F/P,6%,13) = $63, (Sophomore)30,00030,000(F/P,6%,14) = 67, (Junior)30,00030,000(F/P,6%,15) = 71, (senior)30,00030,000(F/P,6%,16) = 76,211 Approach: Convert any cash flow elements in constant dollars into actual dollars. Then use the market interest rate to find the equivalent present value. Assume f = 6% and i = 8% compounded quarterly.
Solution: Required Quarterly Contributions to College Funds Contemporary Engineering Economics, 5th edition, © 2010 V 1 = C(F/A, 2%, 48) V 2 = $229,211 Let V 1 = V 2 and solve for C: C = $2,888.48
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