Three things. First, this is only true of the past and doesn't saying anything about the future. Second, this "study" isn't weighted based on the size of the estate. Third, that 10% matters far more than you could imagine.
> First, this is only true of the past and doesn't saying anything about the future.
Well, I can say that about anything. Oh... the rate of return on capital is higher than the rate of return on labor? Well that's only true of the past, no study has studied the concrete data of what is going to happen in the future (Hint: it's because there is none).
