  Physicists often claim that there is an effective repulsion between fermions,
implied by the Pauli principle, and a corresponding effective attraction
between bosons. We examine the origins of such exchange force ideas, the
validity for them, and the areas where they are highly misleading. We propose
that future explanations of quantum statistics should avoid the idea of a
effective force completely and replace it with more appropriate physical
insights, some of which are suggested here.
