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Слайды и текст к этой презентации:
№1 слайд
Содержание слайда: American University of Armenia
IE 340 – Engineering Economics
Spring Semester, 2016
№2 слайд
Содержание слайда: Outline
Government and Public projects
Public Goods/Consumer and Producer Surplus
The concept of Benefit/Cost (B/C) ratio
We want Benefits to be higher than costs
Examples
Incremental B/C ratio
Compare with IRR method
№3 слайд
Содержание слайда: Government and Public Projects
Public projects are those funded, owned and operated by a government
Governmental agencies may have a hand in a number of projects through the provision of loans or other means of financial help, but they are not considered to be public projects
Most public projects relate to work a government does to fulfill a public purpose, and commonly they include such things as road repair and construction, public building construction, schools, and even public parks.
№4 слайд
Содержание слайда: Public Goods
A public good is a good that is both non-excludable and non-rival in that individuals cannot be effectively excluded from use and where use by one individual does not reduce availability to others.
Examples of public goods include knowledge, lighthouses, national defense, flood control systems or street lighting
№5 слайд
Содержание слайда: Public Goods
Many public goods may at times be subject to excessive use resulting in negative externalities (air pollution)
Public goods problems are often closely related to the "free-rider" problem, in which people not paying for the good may continue to access it
№6 слайд
Содержание слайда: Welfare Aim of the Government
The chief aim of the government is:
National defense
General welfare of its citizens
Ultimate goal of the government is to serve its citizens
Thus, with some exceptions what is good for the citizens has to be good for the government
BUT, these exceptions are quite important!
№7 слайд
Содержание слайда: Public Activities
Not all public activities have to have direct impact on ALL the citizens of the country
Examples:
Building a better road between Hrazdan and Tsaghkadzor doesn’t benefit those who never take it
Building a new school in Vanadzor doesn’t benefit someone who lives in Goris, or even someone living in Vanadzor, but has no children
№8 слайд
Содержание слайда: Public Activities
Moreover, some public activities might have a negative effect on a part of the country’s population
Examples:
Building a dam on a river might have a positive effect overall (additional source of electrical power for the country), but might harm the inhabitants of a nearby village through environmental changes
№9 слайд
Содержание слайда: Public Activities
Public projects are usually much more complicated than private projects in many respects
That is why we dedicate a separate lecture on studying the differences between the two types of activities, and the ways to measure their overall effects
№10 слайд
Содержание слайда: Public vs Private Projects
There are number of special factors that are not ordinarily found in privately financed projects
As such the different decision criteria are often used for public projects (Benefit/Cost method)
№11 слайд
Содержание слайда: Main differences between public and private projects
Purpose:
Private projects are more profit oriented, while public projects might stress more on health, protection, etc., even without bringing profit
Sources of capital:
Apart from private funds, public projects can be financed with the receipts of taxes, loans without or at low interest
Multiple purposes:
Public projects are more likely to be multipurpose (e.g. reservoir can serve to generate power, but also for irrigation or for recreation)
№12 слайд
Содержание слайда: Main differences between public and private projects
Project Life:
Private projects are usually much shorter (5 to 20 years) than public projects (20 to 60 years)
Nature of benefits:
Usually monetary for private projects, often non-monetary for the public ones (difficult to quantify)
Conflicting purposes:
Are quite common for the public projects (dam on the river example)
№13 слайд
Содержание слайда: Main differences between public and private projects
Beneficiaries of the project:
Normally the private investor himself benefits from his project, but the beneficiaries of projects financed by the government are likely to be the general public
Influence of political factors:
Rather rare for private, but quite common for public projects
Measurement of efficiency:
Rate of return for private projects. Very difficult to measure for public projects
№14 слайд
Содержание слайда: How to judge on public projects?
Governments do not usually deal with Profit, therefore we deal with a different “vocabulary”
Benefits are positive public outcomes (favourable consequences of the project to the public)
Disbenefits are negative public outcomes (negative consequences)
Costs are the monetary disbursements of the government (taxpayers)
№15 слайд
Содержание слайда: How to judge on public projects?
Benefit/cost ratios are frequently used for government decisions
Costs accrue to government, but:
Benefits frequently accrue to others!
Benefits may take on non-monetary forms
Some benefits may not be counted!
E.g., profits by hospitals due to pollution
For some programs, costs exceed benefits!
№16 слайд
Содержание слайда: Judging proposed investments
For now, we will avoid some of these problems
In particular, we will assume that:
All relevant costs and benefits have been put in dollar terms
Any method for evaluating projects in the public sector must consider the worthiness of allocating resources to achieve social goals
№17 слайд
Содержание слайда: The Benefit/Cost Method
The Benefit/Cost Method involves the calculation of a ratio of benefits to costs (discounted)
The B/C ratio is defined as the ratio of the equivalent worth of benefits to the equivalent worth of costs (PW, AW or FW)
The B/C ratio is also known as the saving-investment ratio (SIR) by the governmental agencies
№18 слайд
Содержание слайда: A project is desirable if…
> 1
> 1
> 1
№19 слайд
Содержание слайда: A project is desirable if…
№20 слайд
Содержание слайда: Evaluating Independent Projects
Independent projects
the choice of selecting any project is independent of choices regarding any and all other projects
None of the projects, any combination of them, all of them
Whether one project is better than another is unimportant
Criterion for selection: B/C ≥ 1
№21 слайд
Содержание слайда: Example 1: single project
You have a project, which requires a first investment of $10,000. The project will increase benefits by $4,000 per year but it will also increase operating costs by $2,000 per year. The lifetime of the project is 8 years.
Using B/C ratio, and assuming an interest rate of 7%, is this project desirable?
№22 слайд
Содержание слайда: Example 1: single project (cont.)
B/C Ratio =
= 1.194 > 1, which is good…
№23 слайд
Содержание слайда: Example 2: single project
You are considering to install or not a new machine. The first cost is $50,000 and it would reduce costs by $3000 per year. In addition, the new machine would require maintenance cost of $700 per year (the old machine required maintenance costs of $200 per year). Assume interest rate = 5%, lifetime = 10 years and SV=0.
Do a Benefit/Cost analysis and decide if you should buy or not the new machine.
№24 слайд
Содержание слайда: Example 2: single project
Data:
First Cost: $50,000
Reduction in operating costs = $3000 per year
Change in maintenance cost = (proposed – current) = 700 – 200 = 500 per year
Benefits ????
№25 слайд
Содержание слайда: Example 2: single project
Do B/C ratio calculation
Remember to put all the numbers in the same form: PV, AV, or FV
In this case we will consider:
$50,000 as a cost
$3000 as a benefit
$500 as a reduction in benefits
№26 слайд
Содержание слайда: Example 2: single project
Benefit/Cost ratio = 2,500 (P/A, 5%, 10)
50,000
Benefit/Cost ratio = 19,304
50,000
Benefit/Cost ratio = 0.386
Decision: Benefit/Cost ratio is less than 1 and therefore not desirable. Do not buy the new machine
№27 слайд
Содержание слайда: Note
Does my answer change depending if I classify the data as a cost instead of as a reduction in benefits (or classify the data as a benefit instead of a reduction in costs) and vice versa?
Yes and No…
Adding/subtracting a constant amount to the numerator and denominator:
Cannot change whether ratio is > 1 or < 1
a+x/b < 1 vs a/b-x < 1
But can change which ratio is bigger!
№28 слайд
Содержание слайда: In other words…
Adding/subtracting a constant amount to the numerator and denominator will change your answer, but it will not change the fact that the answer is greater than one or lower than one. Therefore, although your B/C ratio will change, your decision (based on if the B/C ratio is greater or lower than one) will not change.
Conventional vs Modified B/C ratio
№29 слайд
Содержание слайда: For example…
If we use the previous example, but this time consider:
$50,000 as a cost
$3000 as a benefit
$500 as a cost
Then, Benefit/Cost ratio = 3,000 (P/A, 5%, 10) = 0.43
50,000+500 (P/A, 5%, 10)
Notice that the answer changed (0.43 versus 0.386), but the fact that the number was still less than 1 didn’t. Therefore, our decision doesn’t change.
№30 слайд
Содержание слайда: Conventional B/C Ratio
Benefit/Cost ratio = =
- operating and maintenance costs
I – initial investment
Benefit/Cost ratio =
№31 слайд
Содержание слайда: Modified B/C Ratio
Benefit/Cost ratio =
- operating and maintenance costs
I – initial investment
Benefit/Cost ratio =
№32 слайд
Содержание слайда: Comparing Mutually Exclusive Projects
Mutually exclusive projects
At most one project may be selected from a group of projects
Requires an incremental B-C analysis
(ΔB / ΔC). WHY? See Example 6-5, p.256
№33 слайд
Содержание слайда: Incremental Analysis
You need to follow the same principles you used in Incremental IRR…
1. Decide if each alternative is good by itself
2. Compare alternatives using incremental analysis
№34 слайд
Содержание слайда: Incremental Analysis
Rank the alternatives in order of increasing total equivalent worth of costs
The “do nothing” is selected as a baseline alternative and compare with the next least cost alternative (alt1)
Compute B/C ratio: is it greater or less than 1?
If greater than 1 drop do nothing alternative and select alt 1 as the next best alternative
Calculate incremental B/C for the difference in benefits and costs of alt1 and next least cost alternative
Note: NEVER COMPARE ABSOLUTE B/C RATIOS. APPLY INCREMENTAL B/C RATIOS!!!
№35 слайд
Содержание слайда: Example: multiple projects
You are deciding between three alternatives and you need to pick the best one. The lifetimes of all machines is 20 years. Assuming a 5% interest rate, which machine should you select?
Use B/C ratio to make your decision
№36 слайд
Содержание слайда: Alternative A
First cost = $45,000
Tax benefits = $7,000 per year
Salvage value of $30,000
Operating costs = $1,500 per year
Maintenance costs = $2,000 per year
№37 слайд
Содержание слайда: Alternative B
First cost = $25,000
Tax benefits = $3,000 per year
Salvage value = $15,000
Operating costs = $2,500 per year
Maintenance costs = $3,000 per year
№38 слайд
Содержание слайда: Alternative C
First cost = $65,000
Tax benefits = $8,000 per year
Salvage value = $25,000
Operating costs = $1000 per year
Maintenance costs = $1500 per year
№39 слайд
Содержание слайда: Summary
№40 слайд
Содержание слайда: Incremental Analysis
№41 слайд
Содержание слайда: Analysis of Alternative A
B/C ratio for Alt A = Benefits
Cost
= 7,000 (P/A, 5%, 20) + 30,000 (P/F, 5%, 20)
45,000 + (1,500+2000) (P/A, 5%, 20)
= 98,542
88,617
= 1.1199 > 1 (Good)
№42 слайд
Содержание слайда: Analysis of Alternative B
B/C ratio for Alt B = Benefits
Cost
= 3,000 (P/A, 5%, 20) + 15,000 (P/F, 5%, 20)
25,000 + (2,500+3000) (P/A, 5%, 20)
= 43,040
93,542
= 0.4601 < 1 (Bad, Not good)
If we do the same for Alternative C we get a B/C ratio of 1.135, which is > 1 (Good)
№43 слайд
Содержание слайда: Incremental Analysis
№44 слайд
Содержание слайда: Incremental Analysis (cont.)
Note that the benefits and costs are obtained from the previous analysis (we made the analysis in terms of Present Worth)
For example, for Alternative A:
Benefits = 7,000 (P/A, 5%, 20) + 30,000 (P/F, 5%, 20)
= $98,542
Costs = 45,000 + (1,500+2000) (P/A, 5%, 20)
= $88,617
№45 слайд
Содержание слайда: Incremental Analysis (cont.)
Compute Incremental B/C for C-A
In this case, since Incremental B/C of (C-A) = 1.40 we prefer Alternative C over Alternative A. Since we have no more alternatives we decide that Alternative C is the best one
Examples 6.6 and 6.7, page 258
№46 слайд
Содержание слайда: Review
We learned how to compare projects by
Net benefit
Benefit/cost ratio:
Compare projects against each other in order of increasing cost
Size of ratio does not say which is best!
Benefit/cost ratio tells you:
Whether an investment is beneficial or not (depending if the B/C ratio is >1 (beneficial) or <1 (not beneficial)
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