[Squirrelloid]

Regarding maximizing income:
Income modifiers are compounded, which means that taking production scales with order scales is better than production scales without order scales. (Ie, it ends up being more than a 9% increase).

Basically, its not x + x*.21 + x*.09, its x*1.21*1.09.

The most obvious conclusion is that taking any scale with an income impact actually has a larger impact when combined with other income scale modifiers than it would by itself. So if you want to maximize income, you can't take negative income modifiers at all, and want to take as many positive scales as possible.

Ex. 21+9+9=39% is the perceived income effect, but the actual is 1.21*1.09*1.09 = 1.438, or 44% more income

Ex. 21 - 9 - 9 = +3% perceived income effect, actual is 1.21*.91*.91 = 1.002, or 0.2% more income

So taking production scales is actually worth doing, although if you're purely maximizing income, i'd take growth first. You certainly don't take a negative income scale.