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  1. ForecastsUnited States

    US: in 2007 CBO projected public debt falling to 20% of GDP by 2017. The outcome: 76%

    20%projected for 2017 (January 2007)
    76%outcome

    US: debt held by the public, % of GDP

    050100200520362020

    The projection knew nothing of the 2008 crisis or the laws after it, and could not: CBO’s baseline assumes current law. Each later projection raised the path.

    Source: CBO: budget baselines and their evaluation; Social Security Trustees Reports 1982–2026Open on the chart →
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    Debt held by the public: federal debt held by everyone but federal trust funds (the Fed included), as a percentage of fiscal-year GDP.

    The solid line is debt in CBO’s data. Dashed lines: January baselines of different years, 2007 highlighted.

    CBO January baselines 2007–2026 in percent of GDP (“10-Year Budget Projections” workbooks); actual: CBO Historical Budget Data (February 2026).

    A baseline’s miss is not only economists’ error: it includes every law passed later (by CBO’s own estimate their 10-year effect is on average larger than its own forecasting error).

    A question for this picture

    If every new projection sits above the previous one, where will the next one land?

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