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| {{Refimprove|date=January 2010}}
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| [[File:DCFM Calculator.JPG|thumb|Spreadsheet uses [[Free cash flow]]s to estimate stock's [[Fair Value]] and measure the sensibility of [[Weighted average cost of capital|WACC]] and [[Perpetual growth]] ]]
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| In [[finance]], '''discounted cash flow''' ('''DCF''') analysis is a method of valuing a project, company, or [[financial asset|asset]] using the concepts of the [[time value of money]]. All future [[cash flow]]s are estimated and [[Discounting|discounted]] to give their [[present value]]s (PVs)—the sum of all future cash flows, both incoming and outgoing, is the [[net present value]] (NPV), which is taken as the value or price of the cash flows in question. Present value may also be expressed as a number of '''years' purchase''' of the future undiscounted annual cash flows expected to arise.
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| Using DCF analysis to compute the NPV takes as input cash flows and a discount rate and gives as output a price; the opposite process—taking cash flows and a price and inferring a discount rate—is called the [[Yield (finance)|yield]].
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| Discounted cash flow analysis is widely used in investment finance, [[real estate developer|real estate development]], [[corporate financial]] management and [[patent valuation]].
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| ==Discount rate==
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| {{main|Discounting}}
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| The most widely used method of [[discounting]] is exponential discounting, which values future cash flows as "how much money would have to be invested currently, at a given rate of return, to yield the cash flow in future." Other methods of discounting, such as [[hyperbolic discounting]], are studied in academia and said to reflect intuitive decision-making, but are not generally used in industry.
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| The discount rate used is generally the appropriate [[weighted average cost of capital]] (WACC), that reflects the risk of the cashflows. The discount rate reflects two things:
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| # Time value of money ([[risk-free rate]]) – according to the theory of [[time preference]], investors would rather have cash immediately than having to wait and must therefore be compensated by paying for the delay
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| # [[Risk premium]] – reflects the extra return investors demand because they want to be compensated for the risk that the cash flow might not materialize after all
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| ==History==
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| Discounted cash flow calculations have been used in some form since money was first lent at interest in ancient times. As a method of asset valuation it has often been opposed to accounting book value, which is based on the amount paid for the asset. Following the stock market crash of 1929, discounted cash flow analysis gained popularity as a valuation method for stocks. [[Irving Fisher]] in his 1930 book ''The Theory of Interest'' and [[John Burr Williams]]'s 1938 text ''[[The Theory of Investment Value]]'' first formally expressed the DCF method in modern economic terms.
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| ==Mathematics==
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| ===Discounted cash flows===
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| The discounted cash flow formula is derived from the [[future value]] formula for calculating the [[time value of money]] and compounding returns.
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| :<math>DCF = \frac{CF_1}{(1+r)^1} + \frac{CF_2}{(1+r)^2} + \dotsb +
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| \frac{CF_n}{(1+r)^n}</math>
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| :<math>FV = DCF \cdot (1+i)^n</math>
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| Thus the discounted present value (for one cash flow in one future period) is expressed as:
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| :<math>DPV = \frac{FV}{(1+i)^n} = {FV} {(1-d)^{n}}</math>
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| where
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| * ''DPV'' is the discounted present value of the future cash flow (''FV''), or ''FV'' adjusted for the delay in receipt;
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| * ''FV'' is the nominal value of a cash flow amount in a future period;
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| * ''i'' is the interest rate, which reflects the cost of tying up capital and may also allow for the risk that the payment may not be received in full;
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| * ''d'' is the [[Annual effective discount rate|discount rate]], which is ''i''/(1+''i''), i.e., the interest rate expressed as a deduction at the beginning of the year instead of an addition at the end of the year;
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| * ''n'' is the time in years before the future cash flow occurs.
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| Where multiple cash flows in multiple time periods are discounted, it is necessary to sum them as follows:
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| :<math>DPV = \sum_{t=0}^{N} \frac{FV_t}{(1+i)^{t}}</math>
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| for each future cash flow (''FV'') at any time period (''t'') in years from the present time, summed over all time periods. The sum can then be used as a [[net present value]] figure. If the amount to be paid at time 0 (now) for all the future cash flows is known, then that amount can be substituted for ''DPV'' and the equation can be solved for ''i'', that is the [[internal rate of return]].
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| All the above assumes that the interest rate remains constant throughout the whole period.
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| ===Continuous cash flows===
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| For continuous cash flows, the summation in the above formula is replaced by an integration:
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| :<math>DPV= \int_0^T FV(t) \, e^{-\lambda t} dt \,,</math>
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| where <math>FV(t)</math> is now the ''rate'' of cash flow, and <math>\lambda = log(1+i)</math>.
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| ==Example DCF==
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| To show how discounted cash flow analysis is performed, consider the following simplified example.
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| *John Doe buys a house for $100,000. Three years later, he expects to be able to sell this house for $150,000.
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| Simple subtraction suggests that the value of his profit on such a transaction would be $150,000 − $100,000 = $50,000, or 50%. If that $50,000 is [[amortization (business)|amortized]] over the three years, his implied annual return (known as the [[internal rate of return]]) would be about 14.5%. Looking at those figures, he might be justified in thinking that the purchase looked like a good idea.
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| 1.145<sup>3</sup> x 100000 = 150000 approximately.
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| However, since three years have passed between the purchase and the sale, any cash flow from the sale must be discounted accordingly. At the time John Doe buys the house, the 3-year [[United States Treasury security#Treasury note|US Treasury Note]] rate is 5% per annum. Treasury Notes are generally considered to be inherently less risky than real estate, since the value of the Note is guaranteed by the US Government and there is a [[liquidity|liquid]] market for the purchase and sale of T-Notes. If he hadn't put his money into buying the house, he could have invested it in the relatively safe T-Notes instead. This 5% per annum can therefore be regarded as the [[risk-free interest rate]] for the relevant period (3 years).
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| Using the DPV formula above (FV=$150,000, i=0.05, n=3), that means that the value of $150,000 received in three years actually has a [[present value]] of $129,576 (rounded off). In other words we would need to invest $129,576 in a T-Bond now to get $150,000 in 3 years almost risk free. This is a quantitative way of showing that money in the future is not as valuable as money in the present ($150,000 in 3 years isn't worth the same as $150,000 now; it is worth $129,576 now).
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| Subtracting the purchase price of the house ($100,000) from the [[present value]] results in the [[net present value]] of the whole transaction, which would be $29,576 or a little more than 29% of the purchase price.
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| Another way of looking at the deal as the excess return achieved (over the risk-free rate) is (114.5 - 105)/(100 + 5) or approximately 9.0% (still very respectable).
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| But what about risk?
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| We assume that the $150,000 is John's best estimate of the sale price that he will be able to achieve in 3 years time (after deducting all expenses, of course). There is of course a lot of uncertainty about house prices, and the outcome may end up higher or lower than this estimate.
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| (The house John is buying is in a "good neighborhood," but market values have been rising quite a lot lately and the real estate market analysts in the media are talking about a slow-down and higher interest rates. There is a probability that John might not be able to get the full $150,000 he is expecting in three years due to a slowing of price appreciation, or that loss of liquidity in the real estate market might make it very hard for him to sell at all.)
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| Under normal circumstances, people entering into such transactions are risk-averse, that is to say that they are prepared to accept a lower expected return for the sake of avoiding risk. See [[Capital asset pricing model]] for a further discussion of this. For the sake of the example (and this is a gross simplification), let's assume that he values this particular risk at 5% per annum (we could perform a more precise probabilistic analysis of the risk, but that is beyond the scope of this article). Therefore, allowing for this risk, his expected return is now 9.0% per annum (the arithmetic is the same as above).
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| And the excess return over the risk-free rate is now (109 - 105)/(100 + 5) which comes to approximately 3.8% per annum.
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| That return rate may seem low, but it is still positive after all of our discounting, suggesting that the investment decision is probably a good one: it produces enough profit to compensate for tying up capital and incurring risk with a little extra left over. When investors and managers perform DCF analysis, the important thing is that the net present value of the decision after discounting all future cash flows at least be positive (more than zero). If it is negative, that means that the investment decision would actually ''lose'' money even if it appears to generate a nominal profit. For instance, if the expected sale price of John Doe's house in the example above was not $150,000 in three years, but ''$130,000'' in three years or $150,000 in ''five'' years, then on the above assumptions buying the house would actually cause John to ''lose'' money in present-value terms (about $3,000 in the first case, and about $8,000 in the second). Similarly, if the house was located in an undesirable neighborhood and the [[Federal Reserve Bank]] was about to raise interest rates by five percentage points, then the risk factor would be a lot higher than 5%: it might not be possible for him to predict a profit in discounted terms even if he thinks he could sell the house for ''$200,000'' in three years.
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| In this example, only one future cash flow was considered. For a decision which generates multiple cash flows in multiple time periods, all the cash flows must be discounted and then summed into a single [[net present value]].
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| ==Methods of appraisal of a company or project==
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| This is necessarily a simple treatment of a complex subject: more detail is beyond the scope of this article.
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| For these valuation purposes, a number of different DCF methods are distinguished today, some of which are outlined below. The details are likely to vary depending on the [[capital structure]] of the company. However the assumptions used in the appraisal (especially the equity discount rate and the projection of the cash flows to be achieved) are likely to be at least as important as the precise model used.
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| Both the income stream selected and the associated [[cost of capital]] model determine the valuation result obtained with each method.
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| This is one reason these valuation methods are formally referred to as the Discounted Future Economic Income methods.
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| * Equity-Approach
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| ** [[Flows to equity]] approach (FTE)
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| Discount the cash flows available to the holders of equity capital, after allowing for cost of servicing debt capital
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| Advantages: Makes explicit allowance for the cost of debt capital
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| Disadvantages: Requires judgement on choice of discount rate
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| * Entity-Approach:
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| ** [[Adjusted present value]] approach (APV)
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| Discount the cash flows before allowing for the debt capital (but allowing for the tax relief obtained on the debt capital)
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| Advantages: Simpler to apply if a specific project is being valued which does not have earmarked debt capital finance
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| Disadvantages: Requires judgement on choice of discount rate; no explicit allowance for cost of debt capital, which may be much higher than a "risk-free" rate
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| ** [[Weighted average cost of capital]] approach (WACC)
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| Derive a weighted cost of the capital obtained from the various sources and use that discount rate to discount the cash flows from the project
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| Advantages: Overcomes the requirement for debt capital finance to be earmarked to particular projects
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| Disadvantages: Care must be exercised in the selection of the appropriate income stream. The net cash flow to total invested capital is the generally accepted choice.
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| ** [[Total cash flow]] approach (TCF){{Clarify|date=February 2009}}
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| This distinction illustrates that the Discounted Cash Flow method can be used to determine the value of various business ownership interests. These can include equity or debt holders.
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| Alternatively, the method can be used to value the company based on the value of total invested capital. In each case, the differences lie in the choice of the income stream and discount rate. For example, the
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| net cash flow to total invested capital and WACC are appropriate when valuing a company based on the market value of all invested capital.<ref>{{cite book
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| | last = Pratt | first = Shannon | authorlink = | coauthors = Robert F. Reilly, Robert P. Schweihs | title = Valuing a Business | publisher = McGraw Hill | series = McGraw-Hill Professional | year = 2000 | doi = | url = http://books.google.com/books?id=WO6wd8O8dsUC&printsec=frontcover&dq=shannon+pratt#PPA913,M1 | isbn = 0-07-135615-0 }}
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| </ref>
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| ==Shortcomings==
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| Commercial banks have widely used discounted cash flow as a method of valuing commercial real estate construction projects. This practice has two substantial shortcomings. 1) The discount rate assumption relies on the market for competing investments at the time of the analysis, which would likely change, perhaps dramatically, over time, and 2) straight line assumptions about income increasing over ten years are generally based upon historic increases in market rent but never factors in the cyclical nature of many real estate markets. Most loans are made during boom real estate markets and these markets usually last fewer than ten years. Using DCF to analyze commercial real estate during any but the early years of a boom market will lead to overvaluation of the asset{{Citation needed|date=August 2013}}.
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| Discounted cash flow models are powerful, but they do have shortcomings. DCF is merely a mechanical valuation tool, which makes it subject to the principle "[[garbage in, garbage out]]". Small changes in inputs can result in large changes in the value of a company. Instead of trying to project the cash flows to infinity, terminal value techniques are often used. A simple annuity is used to estimate the terminal value past 10 years, for example. This is done because it is harder to come to a realistic estimate of the cash flows as time goes on involves calculating the period of time likely to recoup the initial outlay.<ref>{{cite web |url=http://www.investopedia.com/terms/d/dcf.asp |title=Discounted Cash Flow - DCF|publisher=investopedia.com |accessdate=22 November 2010}}</ref>
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| ==See also==
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| {{multicol}}
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| *[[Adjusted present value]]
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| *[[Capital asset pricing model]]
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| *[[Capital budgeting]]
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| *[[Cost of capital]]
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| *[[Economic value added]]
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| *[[Enterprise value]]
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| *[[Enterprise DCF]]
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| *[[Financial modeling]]
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| *[[Flows to equity]]
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| {{multicol-break}}
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| *[[Free cash flow]]
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| *[[Internal rate of return]]
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| *[[Market value added]]
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| *[[Net present value]]
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| * [[Patent valuation]]
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| *[[Residual Income Valuation]]
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| *[[Time value of money]]
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| *[[Valuation using discounted cash flows]]
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| *[[Weighted average cost of capital]]
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| {{multicol-end}}
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| ==References==
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| {{Reflist}}
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| ==External links==
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| *[http://ocw.mit.edu/courses/nuclear-engineering/22-812j-managing-nuclear-technology-spring-2004/lecture-notes/lec03slides.pdf Continuous compounding/cash flows]
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| *[http://www.econlib.org/library/YPDBooks/Fisher/fshToI.html ''The Theory of Interest ''] at the [[Library of Economics and Liberty]].
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| *[http://www.wacc.biz Monography about DCF (including some lectures on DCF)].
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| *[http://www.fool.com/news/commentary/2005/commentary05032803.htm Foolish Use of DCF]. ''[[Motley Fool]]''.
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| *[http://www.thestreet.com/university/personalfinance/10385275.html Getting Started With Discounted Cash Flows]. ''[[TheStreet.com|The Street]]''.
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| *[http://www.ifac.org/Members/DownLoads/Project_Appraisal_Using_DCF_formatted.pdf ''International Good Practice: Guidance on Project Appraisal Using Discounted Cash Flow''], [[International Federation of Accountants]], June 2008, ISBN 978-1-934779-39-2
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| *[http://papers.ssrn.com/sol3/papers.cfm?abstract_id=381880 Equivalence between Discounted Cash Flow (DCF) and Residual Income (RI)] Working paper; Duke University - Center for Health Policy, Law and Management
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| ==Further reading==
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| *[http://www.iacam.org/ International Association of CPAs, Attorneys, and Management (IACAM)] (Free DCF Valuation E-Book Guidebook)
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| *{{cite book | author=International Federation of Accountants | title=Project Appraisal Using Discounted Cash Flow | year=2007}}
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| *{{cite book | last=Copeland | first=Thomas E. | coauthors=Tim Koller, Jack Murrin | title=Valuation: Measuring and Managing the Value of Companies | publisher=[[John Wiley & Sons]] | location=New York | year=2000 | isbn=0-471-36190-9}}
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| *{{cite book | author=[[Damodaran, Aswath]] | title=Investment Valuation: Tools and Techniques for Determining the Value of Any Asset | publisher=[[John Wiley & Sons]] | location=New York | year=1996 | isbn=0-471-13393-0}}
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| *{{cite book | author=Rosenbaum, Joshua | coauthors=Joshua Pearl | title=Investment Banking: Valuation, Leveraged Buyouts, and Mergers & Acquisitions | publisher=[[John Wiley & Sons]] | location=Hoboken, NJ | year=2009 | isbn=0-470-44220-4}}
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| *{{cite book | author=James R. Hitchnera | title=Financial Valuation: Applications and Models | publisher=[[Wiley Finance]] | location=USA | year=2006 | isbn=0-471-76117-6}}
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| *{{cite book | author=Chander Sawhney| title=Discounted Cash Flow –The Prominent Income Approach to Valuation| publisher=[http://corporatevaluations.in/static-1047-22-oth%20-Articles%20and%20Research%20Hub] | location=INDIA | year=2012 | isbn=}}
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| {{Corporate finance and investment banking}}
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| [[Category:Basic financial concepts]]
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| [[Category:Real estate]]
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| [[Category:Cash flow]]
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| [[Category:Corporate finance]]
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