It's a "bell curve" that, in every single swarm redistribution pulse (millions of those, happen every transaction), sets a cap to the reward from the pulse (basic income) based on how much a person has received so far (monthly, probably), anyone above average will get exponentially less, up to "some people" who get nothing. It's a dynamic cap, that adapts and adjusts itself based on trends like tax-rates, how densely connected the transaction-web is in different clusters.