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Chapter 6:
Comparison and Selection Among
Alternatives
The objective of chapter 6 is to evaluate correctly
capital investment alternatives when the time value of
money is a key influence.
• In this chapter we examine feasible design alternatives.
• The decisions considered are those selecting from
among a set of mutually exclusive alternatives.
Mutually exclusive alternatives (MEAs)
• We examine these on the basis of economic
considerations alone.
• The alternatives may have different initial investments
and their annual revenues and costs may vary.
• The basic methods from chapter 5 provide the basis for
economic comparison of the alternatives.
Apply this rule, based on Principle 2 from
Chapter 1.
The alternative that requires the minimum investment of
capital and produces satisfactory functional results will
be chosen unless the incremental capital associated with
an alternative having a larger investment can be justified
with respect to its incremental benefits. This alternative
is the base alternative.
For alternatives that have a larger investment
than the base…
If the extra benefits obtained by investing additional
capital are better than those that could be obtained
from investment of the same capital elsewhere in the
company at the MARR, the investment should be
made.
There are two basic types of alternatives.
Investment Alternatives
Those with initial capital investment that produces
positive cash flows from increased revenue,
savings through reduced costs, or both.
Cost Alternatives
Those with all negative cash flows, except for a
possible positive cash flow from disposal of assets
at the end of the project’s useful life.
Select the alternative that gives you the most
money!
• For investment alternatives the PW of all cash
flows must be positive, at the MARR, to be
attractive. Select the alternative with the largest
PW.
• For cost alternatives the PW of all cash flows will
be negative. Select the alternative with the largest
(smallest in absolute value) PW.
PW(10%)A= 9,738$
PW(10%)B= 10,131$
PW(10%)B-A = 393$
PW(10%)C= -477,077$
PW(10%)D= -463,607$
PW(10%)D-C = 13,470$
Determining the study period.
• A study period (or planning horizon) is the time
period over which MEAs are compared, and it must
be appropriate for the decision situation.
• MEAs can have equal lives (in which case the study
period used is these equal lives), or they can have
unequal lives, and at least one does not match the
study period.
• The equal life case is straightforward, and was used
in the previous two examples.
Comparing MEAs with equal lives.
Equivalent Worth Methods:
The MEAs can be compared by directly comparing their
equivalent worth (PW, FW, or AW) calculated using the MARR.
The decision will be the same regardless of the equivalent
worth method you use.
Rate of Return Methods
• The return on investment (rate of return) is a popular measure
of investment performance.
• Selecting the alternative with the largest rate of return can lead
to incorrect decisions—do not compare the IRR of one
alternative to the IRR of another alternative. The only
comparison is the IRR to the MARR.
• Remember, the base alternative must be attractive (rate of
return greater than the MARR), and the additional investment
in other alternatives must itself make a satisfactory rate of
return on that increment.
PW(10%)A= 9,738$
PW(10%)B= 10,131$
PW(10%)B-A = 393$
IRR(A)= 17.3%
IRR(B)= 16.3%
IRR(B-A) =11.4%
Chapter 6 HW:
Examples: 6-3, 6-7
Problems: 6-1, 6-2, 6-7, 6-15, 6-19, 6-20, 6-22, 6-26

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‏‏Ch6 - نسخة.ppt

  • 1. Chapter 6: Comparison and Selection Among Alternatives The objective of chapter 6 is to evaluate correctly capital investment alternatives when the time value of money is a key influence. • In this chapter we examine feasible design alternatives. • The decisions considered are those selecting from among a set of mutually exclusive alternatives.
  • 2. Mutually exclusive alternatives (MEAs) • We examine these on the basis of economic considerations alone. • The alternatives may have different initial investments and their annual revenues and costs may vary. • The basic methods from chapter 5 provide the basis for economic comparison of the alternatives.
  • 3. Apply this rule, based on Principle 2 from Chapter 1. The alternative that requires the minimum investment of capital and produces satisfactory functional results will be chosen unless the incremental capital associated with an alternative having a larger investment can be justified with respect to its incremental benefits. This alternative is the base alternative.
  • 4. For alternatives that have a larger investment than the base… If the extra benefits obtained by investing additional capital are better than those that could be obtained from investment of the same capital elsewhere in the company at the MARR, the investment should be made.
  • 5. There are two basic types of alternatives. Investment Alternatives Those with initial capital investment that produces positive cash flows from increased revenue, savings through reduced costs, or both. Cost Alternatives Those with all negative cash flows, except for a possible positive cash flow from disposal of assets at the end of the project’s useful life.
  • 6. Select the alternative that gives you the most money! • For investment alternatives the PW of all cash flows must be positive, at the MARR, to be attractive. Select the alternative with the largest PW. • For cost alternatives the PW of all cash flows will be negative. Select the alternative with the largest (smallest in absolute value) PW.
  • 9. Determining the study period. • A study period (or planning horizon) is the time period over which MEAs are compared, and it must be appropriate for the decision situation. • MEAs can have equal lives (in which case the study period used is these equal lives), or they can have unequal lives, and at least one does not match the study period. • The equal life case is straightforward, and was used in the previous two examples.
  • 10. Comparing MEAs with equal lives. Equivalent Worth Methods: The MEAs can be compared by directly comparing their equivalent worth (PW, FW, or AW) calculated using the MARR. The decision will be the same regardless of the equivalent worth method you use.
  • 11.
  • 12.
  • 13.
  • 14.
  • 15.
  • 16. Rate of Return Methods • The return on investment (rate of return) is a popular measure of investment performance. • Selecting the alternative with the largest rate of return can lead to incorrect decisions—do not compare the IRR of one alternative to the IRR of another alternative. The only comparison is the IRR to the MARR. • Remember, the base alternative must be attractive (rate of return greater than the MARR), and the additional investment in other alternatives must itself make a satisfactory rate of return on that increment.
  • 17. PW(10%)A= 9,738$ PW(10%)B= 10,131$ PW(10%)B-A = 393$ IRR(A)= 17.3% IRR(B)= 16.3% IRR(B-A) =11.4%
  • 18.
  • 19.
  • 20.
  • 21.
  • 22.
  • 23.
  • 24.
  • 25. Chapter 6 HW: Examples: 6-3, 6-7 Problems: 6-1, 6-2, 6-7, 6-15, 6-19, 6-20, 6-22, 6-26