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6.1 Introduction


• The primary object of a public corporation is to generate the maximum amount of profit possible. A simple model is shown below.


• Operating expenses include a number of factors such as,

- Depreciation on capital equipment

- Wages/salaries


• When cash flow occurs over a number of years it is often shown with cash flow diagrams.






• When considering the economic value of a decision, one method is the payback period.



• Simple estimates for the initial investment and yearly savings are,



• There are clearly more factors than can be considered, including,

- changes in material use

- opportunity cost

- setup times

- change in inventory size

- material handling change


• The simple models ignore the conversion between present value and future value. (ie, money now is worth more than the same amount of money later)



• The future value of money can be evaluated using,



• Quite often a Rate of Return (ROR) will be specified by management. This is used in place of interest rates, and can include a companies value for the money. This will always be higher than the typical prime interest rate.


• So far we haven’t considered the effects of taxes. Basically corporate taxes are applied to profits. Therefore we attempt to distribute expenses evenly across the life of a project (even though the majority of the money has been spent in the first year). This distribution is known as depreciation.



• Methods for depreciation are specified in the tax laws. One method is straight line depreciation.



• Another methods is the accelerated cost recovery (ACRS) method that is based on US tax law. A similar version is the Modified ACRS (MACRS) system.



• The ’book value’ for an item is calcuated as,


• Rate of Return (ROR) Analysis -


• Present worth analysis shifts all of the future costs and incomes into a present day sum.


• Benefit Cost Analysis for chosing between alternatives, All costs must be converted to the present values.


• Break Even Analysis


• Return On Investment,


• Consider an assembly line that is currently in use, and the system proposed to replace it. The product line is expected to last 5 years, and then be sold off. The corporate tax rate is 50% and the company policy is to require a 17% rate of return. Should we keep the old line, or install the new one?



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