I have problems with using the word "numeracy" to mean "numeric literacy", but I can adapt. To me, the word "numeracy" means "of or relating to numbers"; therefore, to be numerate means to be of or relating to numbers, and that doesn't make sense.
Numeric literacy (however you name it) results in better decisions. Those who are numerically literate are better able to understand information that's represented by quantities and numbers, and not be confused by sloppy descriptions and poor representations. They have better outcomes in health care, work and other areas where decision-making really pays off.