[alephnan]

There is no such thing as perfect alignment of incentives.

If this were the case, real estate brokers wouldn’t on average have their property on the market longer, and sell for a higher price, then their clients. The classic Freakonomics example.

80/20% profit split is a nice round number, it’s unlikely that this is where perfect alignment is found. If the split was 100/0 or 0/100, we definitely know incentives are not aligned, and so reductio as absurdem there are split points at which the incentives aren’t aligned. In fact, there is likely at most 1 equilibrium of perfect alignment, and the rest aren’t. Furthermore, if 80/20% is fixed as your company changes and administrative costs, production/resource cost changes, then the incentives for each party is constantly changing.