Rational decisions.

[asher553]

"... the crucial fact of the world we live in is that all actions or inactions entail costs which have to be taken into account in order to reach a rational decision. 'Rational' is here used in its most basic sense - the ability to make a ratio, as in 'rational numbers' in mathematics - so that rational decisions are decisions that weigh one thing against another, a trade-off as distinguished from a crusade to achieve some 'good thing' without weighing costs."
- Thomas Sowell