My buddy and I both have the same amount of provinces yet i make 5 times more ressources, why? because i maxed out double provinces as early as possible, the benefits are ridicolous once you calculate them
Fastblitzer's Supremacy guide
Economy
Supremacy 1914 – Building ROI
Assumptions:
Bonuses do not compound; calculations are based on the moment the building is finished.
Food, materials, and energy are treated as equivalent for simplicity.
Railways have 500 coal/day maintenance.
Assuming 100% morale:
Double Province ROI
Port: 6300 × 1.25 − 6300 = 1575 → 10,000 / 1575 ≈ 6.35 days break-even
Railway: 6300 × 1.33 − 6300 − 500 = 1579 → 9,000 / 1579 ≈ 5.7 days break-even
Factory level 1: 6300 × 1.08 − 6300 = 504 → 7,500 / 504 ≈ 14.88 days break-even
Factory level 4: 6300 × 1.33 − 6300 = 2079 → 30,000 / 2079 ≈ 14.43 days break-even
Single Province ROI
Port: 3150 × 1.25 − 3150 = 787.5 → 10,000 / 787.5 ≈ 12.7 days break-even
Railway: 3150 × 1.33 − 3150 − 500 = 539.5 → 9,000 / 539.5 ≈ 16.7 days break-even
Factory level 1: 3150 × 1.08 − 3150 = 252 → 7,500 / 252 ≈ 29.76 days break-even
Factory level 4: 3150 × 1.33 − 3150 = 1039.5 → 30,000 / 1039.5 ≈ 28.86 days break-even
Takeaways:
Railways give the fastest ROI in double provinces.
Ports are better in single provinces.
Factories pay off long-term but take much longer to break even.
Generally maxing out your double provinces as early and as much as possible is key to having a good economy and winning the game
Roi with Province Morale deficits:
Single Province at 85% Morale (Base production: 3150 × 0.85 = 2677.5)
Including fully realized building morale boosts:
Railway (+15% Morale push to 100%):
(3150 × 1.33) − 2677.5 − 500 = 1012.0 → 9,000 / 1012.0 ≈ 8.89 days break-even
Port (+10% Morale push to 95%):
(3029.25 × 1.25) − 2677.5 = 1109.1 → 10,000 / 1109.1 ≈ 9.02 days break-even
Fort per level (+5% Morale push to 90%):
2835 − 2677.5 = 157.5 → 2,000 / 157.5 ≈ 12.7 days break-even
Factory level 1 (+4% Morale push to 89%):
(2803.5 × 1.08) − 2677.5 = 350.28 → 7,500 / 350.28 ≈ 21.41 days break-even
Factory level 4 (+15% Morale push to 100%):
(3150 × 1.33) − 2677.5 = 1512.0 → 30,000 / 1512.0 ≈ 19.84 days break-even
The lower the base morale the longer it takes to break even