Engineering Economics (Uge 40) Flashcards
What is the main thing that separates accounting and engineering economy?
Uncertainty. In engineering economy you have to make a lot of assumptions on the market/prices/interests etc.
What are the 5 main methods in techno-economic analyses?
o Static cost benefit assessment o Annuity method o Net cash flow table o Net present value o Internal rate of return
What is the definition on Simple Payback Period (SPP)?
The time required for savings to offset first (capital) costs.
What is the definition on Simple Return on Investment (ROI)?
How does the formula for ROI looks?
The simple percent return the project pays over its life.
ROI = Annual savings - ((First Cost/Lifetime of project) / First Cost)
Why are the methods “Simple Payback Period” and “Simple Return on Investment” called “simple”?
They do not consider the time value of money.
Simple methods can be used for preliminary checks only and are not suitable for precise calculations
What is done in the “Net cash flow table method”?
All cost paid (in cash) and benefits received (in cash) are calculated and the annual cash flow is calculated as benefit minus cost.
What does the Net cash flow table show?
- It gives an excellent overview on the timeline of incomes and payments over project period.
- It shows how many years it will take before the first positive cash flow can be expected
- Gives an indication on questions of financing and shows in a very simple way the overall situation of a project.
What is “Net Present Value”?
NPV is a way to assess whether the cash flow of a project is positive while taking into account the time value of money. In its simplest form it means that a dollar today, is worth more than a dollar tomorrow.
Which three factors are accounted for in the NPV?
- Opportunity Cost - what you couldn’t do with that money, like invest it.
- Inflation - that dollar will have less purchasing power tomorrow.
- Risk - are you really going to get that dollar tomorrow
Why is it important to include “time value of money” when considering a project?
- A project with a life of several years has cash flows at various times
- To consider dollar amounts at different times, we need to put all amounts on an equal basis taking the time value of money into account.
What is “Present Value”?
The value now of an amount of money F received n years in the future.
What is “Future Value”?
The value n years in the future of an amount of money P received now.
If we can earn interest rate i on investments, the relationship between P (Present Value) and F (Future Value) is:
F = P(1+i)^n
P = F / (1+i)^n
Where n is number of years.
What is inflation?
Prices tend to increase over time due to inflation in money’s value.
The average rate of inflation is reflected by which kind of index?
Consumer Price Index (CPI)