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Cost Benefit Analysis is sometimes referred to as running the numbers because it simply looks at a situation and attempts to add up all the positive contributing factors and then subtract the sum of the negative factors. The end result is either a positive figure if the benefits listed outweigh the costs, or a negative if the reverse turns out to be true. The process is therefore easy to parallel to weighing the pros against the cons on a known scale.
There are instances when a cost benefit analysis is a simple matter because all the variables are known and easily quantifiable so finding the result is just a matter of simple subtraction. However, some instances are more complicated because they involve both tangible or quantifiable factors as well as intangible factors.