That is why not a dollar of the Medicare trust fund will be used to pay for this plan.

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The plan to invest some of the Social Security trust fund on Wall Street purports to address this: real assets would henceforth back the promise and, you might think, there is a double benefit because returns on Wall Street are higher than returns on the fund's existing portfolio of bonds.

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The airline industry likes the cost-based approach to the plan because it provides 94% of the FAA's trust fund revenue but accounts for only 73% of its air traffic control costs.

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