1. Niall Ferguson:
My sole contribution to the statute book of historiography — what I call Ferguson’s Law — states that any great power that spends more on debt service (interest payments on the national debt) than on defense will not stay great for very long. True of Hapsburg Spain, true of ancien régime France, true of the Ottoman Empire, true of the British Empire, this law is about to be put to the test by the US beginning this very year, when (according to the CBO) net interest outlays will be 3.1% of GDP, defense spending 3.0%. Extrapolating defense spending on the assumption that it remains consistently 48% of total discretionary spending (the average of 2014-23), the gap between debt service and defense is going to widen rapidly in the coming years. By 2041, the CBO projections suggest, interest payments (4.6% of GDP) will be double the defense budget (2.3%). Between 1962 and 1989, by way of comparison, interest payments averaged 1.8% of GDP; defense 6.4%. (Sources: niallferguson.com, bloomberg.com)
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