Here's a concept for parties of any stripe:  tax predictability.  Rather than promising deep tax cuts (e.g. Bernier), or rather than threatening investors, small businesses and successful individuals with tax hikes (Trudeau) how about stabilizing the existing progressive tax structure and anchoring spending around that, with exceptions to be made only in extenuating circumstances such as a major global recession?  Some of the moderate CPC candidates like Raitt and O'Toole seem to get this, other CPC candidates and definitely the left do not.