Production
• Factories now genuinely need workers: when there aren't enough people, output actually drops instead of running at full speed regardless.
• Priority sliders in the production window now decide who gets the scarce workers first.

Trade
• Buying from the world market got twice as expensive.
• Selling to the world market pays 50% more.

Diplomacy
• Economic unions can now set their discount and tariff all the way up to 100%.

Rivals
• Other powers grow their economies more aggressively — catching up on income is harder now.
• The army-strength rating is more honest about rivals' real fighting power, not just stockpile numbers.

Territory
• Unintegrated land rebels faster.
• Integrating conquered land into your state costs more.

Performance
• Optimization has been significantly improved.