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pensions are entitlements granted by governments that can be
modified or taken away."25
Because workers have no ownership right to their pen-
sion funds, the government has no fiduciary duty to the
workers. The situation may be even worse for a government-
invested Social Security system. For all the social invest-
ment practices discussed above, state employee pension funds
have been somewhat restrained by the "exclusive benefit
rule," an Internal Revenue Service ruling that requires tax-
exempt trusts to operate solely for the benefit of the
trustees.26 The applicability of that rule to government
pension funds is extremely limited, however, since the tax
exemption status of the trust is irrelevant. The employer--
being the government--is already tax exempt. Therefore, the
only potential enforcement mechanism is for the IRS to
disqualify the plan, meaning that workers would be taxed on
the employer's contribution. Because such a penalty would
fall on innocent third parties, the threat is seldom in-
voked. It is even more unlikely to be invoked in the case
of a government-invested Social Security system. It would
certainly be unfair to do so--to impose a huge new tax on
every American worker because the government mismanages the
investment of its funds. Of course, that assumes an IRS
independent enough to take action against the federal gov-
ernment's own investment decisions. As a result, unlike the
TSP, there appears to be no legal barrier to social invest-
ing under a government-invested Social Security program.
Second, as a defined-contribution program, the TSP is
transparent. Benefits are dependent on the return to their
investment, not on an arbitrary benefit formula. Therefore,
the workers have a direct interest in ensuring that invest-
ments are made solely to maximize their returns. Workers
can see exactly how an investment decision impacts their
retirement benefits. Under a government-invested Social
Security program, benefits would be defined by law and would
be only indirectly affected by individual investment deci-
sions. Therefore, workers would have little incentive to
resist social investing. They would have no direct interest
in whether investments are made solely to maximize returns
or for other purposes.
Finally, the TSP is a voluntary program. If workers
are dissatisfied with investment practices under the pro-
gram, they can refuse to participate. Therefore, fund
managers have an incentive to maximize returns. Failure to
do so will result in a loss of business. In contrast, a
government-invested Social Security system would be mandato-
ry. Workers would be forced to continue contributing 12.4