Then just keep tracing it back up the hierarchy to a single common ancestor, declare that without that ancestor, none of the productivity would have been possib

Then just keep tracing it back up the hierarchy to a single common ancestor, declare that without that ancestor, none of the productivity would have been possible, and by the transitivity of worth that you've described, where one is indefinitely ascribed benefit of his or her acestors, everyone should have equal right to the output.