Evasive Duality

A mini-review concerning the duality between higher orders in perturbative expansions and the quadratic power corrections to the parton model. The note contains no new results and is prompted by a continuing controversy in the literature. Sometimes one considers the two ways of describing QCD observables – in terms of a long perturbative series and in terms of the leading quadratic power correction – as contradicting to each other. While they are in fact dual to each other.