Economists who see regulation as a way to correct the efficiency distortions of monopoly have usually suggested that ideally the government should force a monopoly to:

set price equal to marginal cost.
set marginal revenue equal to marginal cost.
set return on investment to competitive rates.
mark-up prices over costs at fair rates.

In the past many economists have suggested that regulation rather than antitrust is a more appropriate government response to monopoly when:

special interest groups are especially influential in shaping government policy.
monopoly develops because of economies of scale.
when the forces of "creative destruction" are evident.
anti-trust laws are ruled unconstitutional.

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