10,000 Monte Carlo simulations, 15 coupling rules fired, and a demographic time bomb hiding inside the EU's best growth story.
Poland's economy is 42% larger than it would have been without EU membership. GDP growth is running at 3.5% in 2026. The country has narrowed the wealth gap with Western Europe to 81% of the EU average. Unemployment is at 2.8%. Crime is low. R&D spending is climbing.
I ran Poland through WorldSim to 2035: average path, no extreme tilts, 10,000 Monte Carlo trajectories. 15 rules fired. 7 negative, 8 positive. The engine's verdict: "stagnating economy."
GDP per capita grows from $28,485 to $32,749 (+15%). The P90 optimistic scenario nearly doubles income to $56,662 (+73%). Upside exceeds downside by 60%. The growth story is genuine.
So why "stagnating"? Because the engine looks at more than GDP.
Fertility: Demographic Winter. Poland's fertility rate sits at 1.12 children per woman, below the 1.2 threshold for three consecutive years. One of the lowest in Europe. The rule fires a long-term structural drag on the workforce.
Net migration collapses. From +0.9 per 1,000 to 0.0. The inflow that was masking the fertility gap has dried up. The P10 downside: -6.7 per 1,000.
Population 65+ surges to 26.7%. More than a quarter of the population near or past retirement. Fewer workers funding more dependents. The Ageing Pressure rule fires.
Inflation jumps from 3.8% to 6.6% (+76%). Interest rates climb from 3.8% to 4.5%. Petrol crosses $2.12/L, firing the Fuel Pressure rule. Mortgage Stress and Real Income Squeeze both fire.
Poland's GDP per capita reaches $32,749 by 2035. France's reaches $46,134. But petrol costs roughly the same in both countries. The cost convergence is real. The income convergence is slower.
R&D expenditure crosses 2.02% of GDP (+43%). Hi-tech exports reach 14.5%. Internet penetration hits 96.9%. Digital Productivity and R&D Spillover rules fire. Unemployment holds at 3.0%. Crime drops to 714 per 100k.
These positive rules carry the P90 upside. The tech and innovation cluster is what makes the optimistic scenario possible.
7 negative rules fired vs 8 positive. Almost even. The difference: demographics are structural and locked in. Growth depends on sustained investment that may not continue (EU funds taper after 2026).
Poland's GDP is growing. Its working-age population is not. How long before one catches the other?
The complete deep dive includes the demographic fan charts, cost of living breakdown, coupling rule analysis, and the full P10/P50/P90 distributions.
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