Pathology 3. Stagflation, and why it is the hardest regime. Stagflation is the combination that the textbook said could not happen: high inflation and high unemployment / stagnant growth at the same time. It matters out of all proportion to how often it occurs, for two reasons: it refuted the simple Phillips curve, and it presents policymakers with a genuine no-win dilemma. The dilemma is the whole point. A central bank has essentially one tool, the interest rate, and stagflation gives it two problems that demand opposite medicine:
- To fight the inflation, it must raise rates, but that deepens the recession and pushes unemployment higher.
- To fight the unemployment/stagnation, it must cut rates and stimulate, but that pours fuel on the inflation.
There is no setting of the single tool that solves both; the central bank must choose which fire to fight, and either choice inflicts real pain. This is why stagflation is the regime central bankers fear most. Its archetype is the 1970s (the extended case study in M7.05): the two oil shocks (1973 and 1979) were massive cost-push blows that raised prices while crushing output; policy, anxious about unemployment, stayed too accommodative for too long; and, fatally, inflation expectations came un-anchored (Engine 4 in causes of inflation), so a wage-price spiral embedded the inflation into the economy's bloodstream. US CPI reached roughly 14.6% (early 1980) with high unemployment alongside it: the textbook impossibility, made real. The resolution wrote the central lesson of modern central banking: Paul Volcker's Fed (from 1979) raised the fed funds rate to around 19–20%, deliberately inducing the deep 1981–82 recession (US unemployment hit 10.8%), and held until inflation and, above all, inflation expectations broke. The price was enormous and the credibility earned was the foundation of the low-inflation decades that followed. The stagflation lesson an analyst carries forward: once inflation expectations un-anchor, breaking them requires a costly, credible, and sustained tightening, which is precisely why central banks react so hard, so early, to any sign that expectations are slipping. It is also the regime in which the classic 60/40 portfolio fails worst (stocks and bonds fall together, as in 2022), which is why the "growth–inflation 2×2" and inflation hedges (real assets, commodities, gold) are Phase 7 and Phase 9 material.