If matrices and, what is AB? 
Definitions:
Variable Cost
Expenses that vary depending on the amount of products or services a company generates.
Sensitivity Analysis
A technique designed to analyze the effect that varied values of an independent variable exhibit on a particular dependent variable, considering certain presuppositions.
NPV Estimates
Predicted calculations of Net Present Value, which assesses the worth of a project or investment by discounting its future cash flows to their present value.
Dynamic Balance
The balance status of a moving object. For instance, it is common to dynamically balance a truck tire and wheel assembly.
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