"rational cost" is correct and usable in written English.
It is an expression used to describe a cost that is reasonable, sensible, or justified. For example, "The company was able to negotiate a more rational cost for the project supplies."
What is needed is a rigorous and independent process of evaluation for whole body scanners and other equipment — the Transportation Security Administration has 10 at some stage of development — to figure out what provides the best security at the most rational cost.
"The hotel industry has less debt and a more rational cost structure than the airlines.
Of course, there are additional factors to consider when buying outdoor ads — a rational cost, how they complement the overall mix of a company's marketing campaigns and channels, the lifetime value of a customer and more.
This EDDC algorithm is intended for integer cost functions, but can also be applied to rational cost functions after they are scaled.
This assumes, however, that criminals are rational cost-benefit calculators.
No rational cost-benefit analysis could justify such a leap of faith.
He sought to arouse people's spiritual aspirations rather than just appealing to rational cost-benefit analysis.
Can he and will he make a rational cost-benefit analysis on continued support for Somali extremists?
Rational cost-benefit analysis clearly shows it is not in Australia's benefit to treat asylum seekers like animals.
An optimist might hope that my doctor, or someone higher up in the health care hierarchy, made a rational cost-benefit calculation on society's behalf.
Is that kind of rational cost-benefit thinking going to attract Greenpeace, or the Sierra Club, or National Audubon, or whatever?
