# Economic modifiers

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This article is accurate for the latest versions of EU3, Napoleon’s Ambition and In Nomine v3.2.

**Please help update this page** to include information on the HTTT and DW expansions.

To understand how the math works in Europa Universalis 3, you need to understand these things:

- Percentage modifiers are additive, not cumulative
- Flat modifiers are applied before percentage modifiers, unless specifically noted.

## Examples

- A core province with 8 base tax, in a nation with 0 stability, would mean the province yields:
- 8 ducats monthly, going into investments
- 8 ducats yearly going into the treasury

### Percentages

- If stability rises to 2, revenue increases by 20%, raising the province's tax yield to 8 * 120% = 9.6.
- If the nation is fully centralized (in IN), they get a 25% tax increase. The tax yield is increased by a total of 45%, bringing the province's tax value to 8 * 145% = 11.6.

### Flat modifier

- If a workshop is built, it adds 2 to the base tax. At 0 stability/centralization, the yield is 10, but at 2 stability/max centralization, the yield is 14.5 (an increase of 2.9 instead of 2).

## How to evaluate effects

- A percentage modifier is worth more if it modifies an already low percentage. +10 Trade Efficiency from National Trade Policy is worth more when your Trade Efficiency is 40 than when it is 90.
- Flat modifiers is worth more when you also have other percentage modifiers.