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We discuss energy dependence of mean $p_{\rm T}$ correlation with $N_{\rmch}$ basing on general features of high energy collisions such as saturationand geometrical scaling. We use Color Glass Condensate calculation of aneffective interaction radius that scales as a third root of multiplicity, andthen saturates. With this model input we construct scaling variable for $<p_{\rm T} > (N_{\rm ch})$ at different energies both for pp and pPb collisions,and show that recent ALICE data indeed does exhibit this scaling property. Wediscuss energy dependence of the interaction radius and argue that since theradius cannot grow too large, a universal behavior of $< p_{\rm T} >$ for largemultiplicities is expected.

Why mean $p_{\rm T}$ is interesting