However, I know Unix quite well, but I would not say that the effort decrease with task complexity. It's pretty unlikely, because you would reach negative effort soon.
Also I think the ideal UX plot over such axes would be something like a 45° rotated hyperbola, like this http://www.wolframalpha.com/input/?i=x%5E2-y%5E2%3D1+with+x+between+0+and+3+and+y+between+0+and+3
I don't think such curve can be beated.
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