Cash flow factors are the operational, financial, or investment activities which cause cash to enter or leave the organization.
A replacement project is an undertaking in which the company eliminates a project at the end of its life and substitutes another investment.
Sunk costs are retrospective costs that cannot be recovered, and are therefore irrelevant to future investment decisions in the project which incurs them.
Opportunity cost refers to the value lost when a choice is made between two mutually exclusive options.
An externality is an effect of an economic action, the cost or benefit of which is shouldered by someone outside the transaction.
The tax rate is the amount of tax expressed as a percentage.
Depreciation is the process by which an asset is used up, and its cost is allocated over a period of time.
Section 179 of the IRS code allows some pieces of property to be expensed entirely when they are purchased, rather than depreciated.