Power law functions are significantly more complex than the 80-20 rule; depending on the exponent they can be very different. It may be that for the systems you are interested in the 80-20 rule is an adequate approximation, but remain aware they aren't the same thing.
Power law functions are significantly more complex than the 80-20 rule; depending on the exponent they can be very different. It may be that for the systems you are interested in the 80-20 rule is an adequate approximation, but remain aware they aren't the same thing.