  In various research areas related to decision making, problems and their
solutions frequently rely on certain functions being monotonic. In the case of
non-monotonic functions, one would then wish to quantify their lack of
monotonicity. In this paper we develop a method designed specifically for this
task, including quantification of the lack of positivity, negativity, or
sign-constancy in signed measures. We note relevant applications in Insurance,
Finance, and Economics, and discuss some of them in detail.
