Average transverse momentum $\langle p_{\rm T} \rangle$ as a function of the scaling variable $(W/W_0)^{\lambda/(\lambda + 2)} \sqrt{\nch / S_\textrm{T}}$  for pp and p-Pb collisions at various energies (left) and the ratio of all data sets to that in pp collisions at $\sqrt{s} =$ 13 TeV (right). The reference energy $W_0$ corresponds to $\sqrt{s}$ = 7 TeV for pp and $\sqrt{s_{\rm NN}}$ = 5.02 TeV for p-Pb collisions. Statistical and systematic uncertainties are shown as bars and semi-transparent bands, respectively.