DEFINITION of 'Incremental Analysis'
A decisionmaking technique used in business to determine the true cost difference between alternatives. Incremental analysis ignores sunk costs and costs that are the same between the two alternatives to look only at the remaining costs. For this reason, it is also called the "relevant cost approach," "marginal analysis" or "differential analysis."
INVESTOPEDIA EXPLAINS 'Incremental Analysis'
If a company is considering replacing its old copy machine, using incremental analysis, the company would not look at the cost of the existing copy machine because it is a sunk cost (the cost of buying it cannot be reversed). They would look at things like the cost of toner cartridges for each machine, the cost of the electricity run each machine, and most importantly, the time saved by having employees use a more efficient model and perhaps the cost savings of being able to prepare documents inhouse instead of outsourcing them.

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