I was trying to work out my stab costs, couldn't get them to tally with the Economy FAQ or the beta release notes, so I did some research, and decided to post it in FAQ form. I'm not aware that any rigorous faq has been posted before - if I've missed it, sorry.

EDIT: Now added HRE bonus and capping of FAA bonus.

EDIT: DP example now used real values

Note that this applies to 1.08 + November beta

The colony and TP base costs are not mentioned in the Economy FAQ

Otherwise the base costs are the same as in that

The beta release notes say that the 'BB effect on stab costs has been increased' - this post quantifies that

The beta release notes say that each vassal gives a 2% reduction in stab costs (which it doesn't), and then a later patch says that the effect is reduced by centralisation (which it is). Anyway, what I post below is accurate, from tests.

The HRE bonus, only applicable to the beta, and therefore not in the Econonmy FAQ, is covered below

Stability cost =

Base Cost (sum of cities, colonies and TP's)

x DP multiplier

x Badboy multiplier

x FAA multiplier

x Vassal multiplier

x HRE multiplier

x Inflation

e.g. for England, 1617

State religion is protestant

Has 16 cities, 7 are same religion, 9 are not

The non-state-religion cities are all Christian

Has 4 colonies, of various sizes and religions

Has 3 TP's, of various sizes and religions

Base costs = 28x7 + 53x9 + 4x5 + 3x2 = 699

Sum of the effects of the positions of the Innovativeness and Serfdom DP sliders

e.g. If Innovativeness is -10, and Serfdom is +20, the multiplier is 1.10

N.B. The effects of the Serfdom DP slider on stability are double normal in the beta, but this does show up in the DP slider tooltip.

A penalty is added per point of BB, that depends on BB as a percentage of max BB.

-1% per FAA

So with 2 FAA's the multiplier is 0.98

This multiplier is capped at 0.50.

Stability costs are reduced by a percentage that depends on the number of vassals and the setting of the Centralisation DP slider:

The maximum reduction is capped at 20%

Only vassals on the same continent give any benefit

(i.e. Your capital and the vassal capital have the same continent as defined in province.csv)

Vassal religion, size etc. make no difference

e.g OE in 1617 has 6 vassals, Centralisation 5:

So reduction = 4 + 5x2 = 14%

i.e. a multiplier of 0.86

The HRE gets a bonus of 1% for each supportive elector.

An elector is supportive if relations with the elector are >= 100

Electors are as defined in country.csv. Countries with 2 votes only give the same benefit as single vote countries.

If the HRE is an elector, he does not give himself a bonus.

Example, Austria in 1700. There are 15 electors, of which 6 have rels >=100.

Multiplier = 0.94

EDIT: Now added HRE bonus and capping of FAA bonus.

EDIT: DP example now used real values

Note that this applies to 1.08 + November beta

**What's new?**The colony and TP base costs are not mentioned in the Economy FAQ

Otherwise the base costs are the same as in that

The beta release notes say that the 'BB effect on stab costs has been increased' - this post quantifies that

The beta release notes say that each vassal gives a 2% reduction in stab costs (which it doesn't), and then a later patch says that the effect is reduced by centralisation (which it is). Anyway, what I post below is accurate, from tests.

The HRE bonus, only applicable to the beta, and therefore not in the Econonmy FAQ, is covered below

Stability cost =

Base Cost (sum of cities, colonies and TP's)

x DP multiplier

x Badboy multiplier

x FAA multiplier

x Vassal multiplier

x HRE multiplier

x Inflation

**1.1 City Base costs**
Code:

```
For each city, a base cost that depends on whether
- the province has the same religion as the state religion
- and what that state religion is
State Rel. Province Rel. Cost
Christian Same Christian 25
Christian Other Christian 50
Christian Non Christian 100
Non Christian Same religion 25
Non Christian Others 60
Plus/minus the state religion malus/bonus
Protestant 3
Reformed 3
CRC -6
Catholic -6
Orthodox -8
Sunni -6
Shiite -6
Paganism 5
Confucianism -10
Buddhism -5
Hinduism 3
```

**1.2 Colony and TP base costs**
Code:

```
Colony 5
TP 2
Size of colony and TP makes no difference
State religion, and religion of the colony/TP make no difference
```

State religion is protestant

Has 16 cities, 7 are same religion, 9 are not

The non-state-religion cities are all Christian

Has 4 colonies, of various sizes and religions

Has 3 TP's, of various sizes and religions

Base costs = 28x7 + 53x9 + 4x5 + 3x2 = 699

**2. DP multiplier**Sum of the effects of the positions of the Innovativeness and Serfdom DP sliders

e.g. If Innovativeness is -10, and Serfdom is +20, the multiplier is 1.10

N.B. The effects of the Serfdom DP slider on stability are double normal in the beta, but this does show up in the DP slider tooltip.

**3. Badboy multiplier**A penalty is added per point of BB, that depends on BB as a percentage of max BB.

Code:

```
BB as % of Penalty per
max BB BB point
0 - 50% 2%
50 - 100% 4%
> 100% Total penalty of 300%
Note, the 50% threshhold is the integer result from Max BB / 2
Examples with max BB 45:
The 50% threshold is 22 i.e int(45/2)
BB 2.3 : 2.3 x 2 = 4.6% Multiplier = 1.046
BB 22 : 22 x 2 = 44% Multiplier = 1.44
BB 22.1 : 22.1 x 4 = 88.4% Multiplier = 1.884
BB 45 : 45 x 4 = 180% Multiplier = 2.8
BB 45.1 : Flat = 300% Multiplier = 4
BB 100 : Flat = 300% Multiplier = 4
```

**4. Fine Arts Academy**-1% per FAA

So with 2 FAA's the multiplier is 0.98

This multiplier is capped at 0.50.

**5. Vassal**Stability costs are reduced by a percentage that depends on the number of vassals and the setting of the Centralisation DP slider:

Code:

```
Centralisation 1st 2nd & each subsequent
vassal vassal
0 8 4
1 7.2 3.6
2 6.4 3.2
3 5.6 2.8
4 4.8 2.4
5 4 2
6 3.2 1.6
7 2.4 1.2
8 1.6 0.8
9 0.8 0.4
10 0 0
```

Only vassals on the same continent give any benefit

(i.e. Your capital and the vassal capital have the same continent as defined in province.csv)

Vassal religion, size etc. make no difference

e.g OE in 1617 has 6 vassals, Centralisation 5:

So reduction = 4 + 5x2 = 14%

i.e. a multiplier of 0.86

**6. HRE multiplier**The HRE gets a bonus of 1% for each supportive elector.

An elector is supportive if relations with the elector are >= 100

Electors are as defined in country.csv. Countries with 2 votes only give the same benefit as single vote countries.

If the HRE is an elector, he does not give himself a bonus.

Example, Austria in 1700. There are 15 electors, of which 6 have rels >=100.

Multiplier = 0.94

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