Energy independence of inclusive reactions

The question of the energy dependence of inclusive reactions such as a+b→c+ anything is discussed. Factorization arguments are used to show that the condition that abc̄ and ab be exotic for energy independence leads to the energy independence of a number of nonexotic reactions. It is suggested on the basis of simple Regge-exchange diagrams that perhaps a sufficient condition for energy independence, when b fragments into c, is that abc̄, ab, and ac̄ be exotic.