  A current approach to the problem of inertia suggests that the origin of the
inertial properties of matter is the interaction between matter and vacuum
electromagnetic zero-point radiation. Herein, it is shown that zero-point
phenomena can be treated as the origin of inertia only when one chooses to
ignore the mass-energy content of matter. In the absence of any physical basis
for such a choice, it is concluded that zero-point-induced forces must arise in
addition to the intrinsic inertial properties of ordinary matter.
