Income tech?

i've seen that everybody has problems with their ae. I personally find it interesting, cause it balances the game. but if it were possible to adjust it, i would. So, as we have techs for spies, assasins and so, i was thinking that we could have an income tech, wich could either adjust the ae, or increase the income, leaving the ae untouched, the result being the same.

I think it should increase the AE. Each level would increase production of all income units by 0.1%, since +1% would be too much of an increase anyway.