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Big Country Economy Rework

The Backstory:
Long ago, I wrote this mod to fix a core flaw in Terra Invicta: unifying the world massively reduces global IP output, breaking the economic fantasy of a functioning United Earth. I fixed it.
Then I finished my campaign… and walked away.
The game changed. The mod didn’t.
Enter Vengeance — a hero who hacked my code, updated it for the new version, and kept it alive.
Then he finished his campaign… and walked away.
The game changed again. The mod didn’t.
So now it’s me again. Hi there.

Design Philosophy: Real Power, Not Gamey Balance
This mod replaces Terra Invicta’s smoothed power curves with a linear model that reflects how real economies function. Investment Points (IPs) are now tied directly to GDP (1 IP = $12.5B/month), and their effects scale inversely with population — because that’s how budgets work. One dollar goes further in Slovakia than in India, and one IP has greater impact when spread across fewer people. As a result, power now flows from per-capita wealth, not abstract nation size. The United States becomes dominant because it’s rich and relatively lean. India and China are massive, but face real challenges due to dilution.
This mod doesn’t pretend nations are balanced.
They’re not.
You don’t play on a level field.
You play on Earth.

Under this model, forming a United Earth doesn’t instantly make you all-powerful. It gives you scale, not efficiency. With 8 billion people, every IP gets spread razor-thin— and the only way to mitigate that is to have a lot of IPs. A poor United Earth is a bloated giant. A rich one is unstoppable. You’ll need to invest heavily in economy and education if you want your planetary superstate to act like one. Global unity is a platform for power — not the power itself.

v1.6: Economy priority is now fixed. Added infrastructureCost modifier for Oil/Mineral/Core region upgrade, vanilla = 1.0, local default = 1.5
v1.7: Changed the population scaling from (pop/50)^-0.35 to purely linear 50/pop. It applies everywhere the old code was applied; far as I can tell, everywhere.
Give it a whirl, let me know if you spot any major issues. This should WEAKEN "public good" investments in large countries - the larger (pop-based) the country, the less effect each individual IP would have. 50 mil is a "base" country, with 0 multiplier. Anything lower will get bonuses per IP, anything larger will get penalties.
v1.7.2 Reworked returns on Economy priority to better much current meta-economic models.
1+[(Core+Resource)*1.5 + Education + (Diplomacy^2)/5 + (35,000-GDPperCapita)/1,000]/100 % annual GDP increase per 10% investment in GFCF (Economy priority). This closely models the effects of industrial and resource capacity, human capital (education), institutional strength (democracy), and investment saturation in high-income economies.
v1.7.3: Inequality merge now uses realistic 4-pole model which scales with both pop size and GDP. Merging countries with wildly different GDP/capita levels will now be much more problematic. Perhaps you SHOULD have built that wall after all?

Full methodology and economic modeling rationale included in the readMe inside the mod folder.

INSTALL INSTRUCTIONS:
Download the mod through the game: Mods->Browse Steam Workshop->INSTALL
Download and install Unity Mod Manager: https://www.nexusmods.com/site/mods/21/
Point UMM at TI, and ensure the mod reflects there.
Start the game and confirm UMM and mod both work via [Ctrl]+[F10] command