Defensive Productivity
The IMF’s October 2026 outlook is its practical application of a specific economic premise: fiscal sustainability is determined by the race between economic growth and interest rates, not by arbitrary spending caps. This premise, developed and championed by Olivier Blanchard and his associates, fundamentally redefines how the Fund views the relationship between debt, deficit, and prosperity. Debt as a Function of Growth, Not Just Austerity For decades, the standard view was that high debt is always dangerous and must be reduced through primary surpluses (spending more than you earn, excluding interest). Blanchard’s research challenged this by showing that in many modern advanced economies, the growth rate of the economy (g) can exceed the average interest rate on debt (r). When g > r, the debt-to-GDP ratio can shrink even if the government runs a deficit. The economy grows faster than the debt accumulates interest, effectively diluting the burden over time: Δd ≈ (r − g) × d − sp Thi...