Abstract
An exact formula for the "steady" bulk susceptibility of a degenerate electron gas is derived. The deviations from the Landau-Peierls formula are studied for several situations in which the effective electron mass is small. It is concluded that, in any case for which the Landau-Peierls susceptibility differs from the Landau susceptibility, the total susceptibility differs from the Landau-Peierls susceptibility by an amount of the same order of magnitude.

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