  We analyze the density dependence of the contribution of meson-exchange
currents to the lepton-nucleus inclusive cross section in the two-particle
two-hole channel. The model is based on the Relativistic Fermi Gas, where each
nucleus is characterized by its Fermi momentum $k_F$. We find that the 2p-2h
nuclear response functions at their peaks scale as $A k_F^2$ for Fermi momentum
going from 200 to 300 MeV/c and momentum transfer $q$ from $2k_F$ to 2 GeV/c.
This behavior is different from what is found for the quasielastic response,
which scales as $A/k_F$. Additionally, the deep scaling region is also
discussed and there the usual scaling behavior is found to be preferable.
