Availability of alternatives and replaceability of personnel are the factors influence the extent to which substitutability is available to a subunit.
In economics and consumer theory, a substitute, or substitutable good, is a good that consumers perceive to be substantially similar to or sufficiently equivalent to another item. A replacement is a product that can be used in place of another.
There are two ways that a product could be substituted. Product B cannot replace Product A, whereas Product A can be substituted in a one-way or unidirectional fashion.
Thus, Availability of alternatives and replaceability of personnel.
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