Herrnstein, R. J. (1974).
Formal properties of the matching law.
Journal of the Experimental Analysis of Behavior,
21, 159-164.
The matching law implies that any form of behavior approaches an
asymptotic frequency as its reinforcement approaches 100
per cent of the total reinforcement being obtained at a given
time. This asymptote is formally independent of the kind or
quantity of drive or reinforcement associated with the response
in question or with any competing response.