These qualities include that the resource units in question are reusable, discrete, identifiable, and utilized by one individual or social group at a time.
[2] Usually when a vacancy occurs the bulk of the people who fill the position(s) come from the inside the internal labor market rather than hiring someone new.
The individuals being moved and or promoted to a new job/position often gain a higher salary of more benefits which has an important impact on the organization.
[2] The number and initial strata of the vacancy chains created influence the career possibilities of the individuals in the internal labor market and those about to enter.
[2] Synchronous and asynchronous vacancy chains have been found to occur amongst both terrestrial and marine populations of hermit crabs.
[5] This behavior makes hermit crabs an ideal animal model for testing predictions of vacancy chain theory.