Something that just popped in my head. What if you could upgrade the Managers separately. So the manager would be improving profits for you, but also add a point where you pay them a bit as well. But the money you pay the manager is stored separately and used to increase his abilities (Profit, speed, etc.). So Maybe Cabe Johnson take 5% profit from the lemonade stand but you can buy him a new employee increasing productivity. Something along those lines.
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Hmm... Like a Salary feature, hey? This is interesting... Thanks for the feedback!