Stability

Stability is a measure of the nation's internal peace. Unstable nations are more likely to face revolts and turmoil, while stable nations enjoy increased prosperity.

Like many other game mechanics, a player spends monarch power to increase stability, in this case administrative power (). Since these are also the points that go towards increasing the number of ideas and development, it is less likely that a country will always be at peak stability since a player may plan on investing monarch power in other things.

Effects

Maintaining at least neutral (0) or positive stability reduces the chance of rebellion and increases national income, amongst other minor benefits.

Increasing stability also grants +1 Absolutism.

Effects of positive stability

For each additional level of positive stability, a country benefits from:^[1]

	+1%.00	Global trade power
	+5%.00	Foreign spy detection
	−1.00%	National unrest
	+5%.00	National tax modifier
	+0.5%0	Missionary strength
	+0.02%	Commanderies faction influence
	+0.03%	The aristocrats influence
	+0.03%	Jacobin influence
	+50%.00	Stability cost modifier
	+1.00%	Monthly fervor
	+0.50%	Yearly devotion
	−0.02%	Yearly corruption
	+5%.00	Institution spread
	+0.25%	Yearly harmony increase

Effects of negative stability

For each additional level of negative stability, a country is hit by:^[2]

	−1%	Global trade power
	−5%	Foreign spy detection
	+2%	National unrest
	−1%	Yearly legitimacy
	+1%	Annual interest
	−10%	Migration cooldown
	−1%	Yearly devotion
	−5%	Caravan power

Additionally, a nation at −3 stability cannot declare war, and must accept any offered peace deal that is 30% or more below the current warscore.

Stability cost

The base price for increasing stability is 100 administrative power, but overextension and lack of religious unity can increase this cost significantly. Some ideas and advisors decrease this. There are also events and other random factors also modifying the price temporarily. Stability cannot go higher than 3; any events that increase stability at this maximum will not increase stability further.

Main modifiers that affect the cost of raising stability are:

+50% increase per point of positive stability.
+50% if another country has sown discontent in the country.
+ (Overextension / 2)%. Half of overextension is added to the cost.
+(100 − religious unity)%. The lack of religious unity is added to the cost.
+2*(100 − republican tradition)%
A country will have increased stability cost if suffering a disaster.

Reducing stability cost

Artist advisor: −10%
Calm ruler personality: −10%
Loyal Clergy: −2.5% to −10%
Oligarchic Republic government: −5%
Bureaucratic Despotism government: −20%
Tribal Democracy government: −33%
Tribal Kingdom government: −15%
Native Council government: −33%
Siberian Clan Council government: −33%
American Republic government: −10%
Orthodox religion: −10%
Curia controller: −10%
At 100 Mandate: −10%
Fraticelli religion: −5% (only exists in saves imported from CK2)
Cathar religion: −5% (only exists in saves imported from CK2)
Paulician religion: −20% (only exists in saves imported from CK2)
Being a Lucky Nation: −10%
Various decisions, like Unify Islam.

The following national ideas decrease stability cost:

	Traditions	Ideas	Bonuses	Policies
−25%	—	Religious idea 2: Church Attendance Duty	—	Innovative-Espionage: The Espionage Act
−20%	—	Cilli idea 7: Standardized Slovenian Language Muscovite idea 5: Strength of the Boyars Roman idea 3: S.P.Q.R. Sienese idea 4: Sienese Perseverance Welsh idea 1: Cynulliad	—	—
−15%	Vermont traditions	Aymaran idea 6: Encourage the Chal'lla Lusatian idea 3: Lusatian Landtag Mamluk idea 6: Reform of the Succession Texan idea 6: Tejanos Veronese idea 1: Three Households Alike in Dignity	—	—
−10%	Aboriginal traditions Arawak traditions Bharathi traditions Brabant traditions Charruan traditions Circassian traditions Gelre traditions Japanese traditions Malagasy traditions Medri Bahri traditions National traditions Saxe-Lauenburg traditions	Aachen idea 3: Spa City Ajuuraan idea 5: Hydraulic Empire Albanian idea 5: Land of the Eagles Antemoro idea 7: Unify Political and Religious Power Aq Qoyunlu idea 6: Religious Pragmatism Aragonese idea 4: Consolidation of the Estates Ardabili idea 6: Amili Mujtahids Assamese idea 5: Process of Appeal Ava idea 3: Manu Kye Dhammathat Ayutthayan idea 6: Personal Executions Ayyubid idea 6: Strengthen Central Authority Baden idea 5: Reuinification of Baden Bohemian idea 6: The Kutnohorian Deal Brandenburg idea 3: Divide the Estates Brazilian idea 6: Inconfidencia Mineiras Bulgarian idea 1: Confirm The Bulgarian Boyars Byzantine idea 4: Delegated Power Cherokee idea 2: Massacre of the Ani-Kutani Chinese idea 2: Scholar Gentry Clanricarde idea 7: The Lord Presidency Creek idea 2: Creek Caste System Dahomey idea 3: Migan and Mehu Dali idea 5: Benzhu Worship Deccani Sultanate idea 3: Appoint Brahmin Administrators Desmondian idea 2: Cadet Lines Divine idea 2: Church Administration Galician idea 3: Rein in the Cities Genoese idea 1: Reuniting the Nation Great Ming idea 3: Inward Perfection Great Shun idea 4: Obedient to Heaven Guarani idea 1: Appeasement of the Pomberos Gujarat Sultanate idea 3: Gujarati Lipi Hanseatic idea 4: Reformed Hanstag Hessian idea 1: Break the Power of the Estates Highlander idea 4: Episcopalianism Holstein idea 3: 'Ewich Tosamende Ungedelt' Hormuz idea 3: Reform the Moqarrariya Huron idea 6: Feast of the Dead Imerina idea 6: Reform Legal System Indian Sultanate idea 7: Sultanate Bureaucracy Italian (cU) idea 1: Not a Geographical Construct Italian idea 7: Commedia dell'arte Kanem Bornuan idea 6: The Council of Clan Heads Karamanid idea 1: Mehmet Bey's Firman Kongolese idea 3: Aristocratic Merit Korean idea 2: Grand Code for State Administration Krakowian idea 2: Seat of Government K'iche idea 5: Titulos Ladakh idea 5: La dvags rgyal rabs Lan Xang idea 5: Flowering Of Culture Liège idea 1: Guild Democracy Lithuanian idea 2: Auksine Laisve Luban idea 3: Bambudye Lunda idea 6: The Rukonkesh Madyas idea 6: Kinadatuan Manchu idea 3: Manchu Alphabet Mayan idea 1: The Sacred Cenote Mazovian idea 5: Mazovian Lawmaking Meath idea 3: Parliament of Ireland Miao idea 5: Customary Marriage Laws Milanese idea 7: Rulership through Enlightened Principals Mossi idea 7: The Friday Court Mughal idea 7: Fatawa-i-Alamgiri Muiscan idea 1: Zipa and Zaque Münster idea 2: Erbmänner Mutapan idea 2: Rekindling The Royal Fires Native idea 4: Adopt Clan Totems Nepalese Princedom idea 6: Enact Judicial Reforms Nivernais idea 2: Commentaire sur la Coutume du Pays et Duché de Nivernais Nubian idea 2: Nubian Heritage Nuremberger idea 6: Christkindlesmarkt Pagarruyung idea 7: Matrilineal Culture Palatinate idea 7: Mannheim school of Orchestra Pattani idea 6: Protection of Private Property Polish idea 2: Nihil Novi Prussian idea 1: Legacy of the Teutonic Knight Pueblo idea 5: Kachina Dolls Punjabi idea 5: Adopt Standardized Gurmukhi Script Ruthenian idea 5: Heritage of the Old Rus' Sami idea 7: Standardize Literary Language Scottish idea 4: Comets? Serbian idea 2: Bastion of Orthodoxy Shawnee idea 3: The Bread Dance Silesian idea 2: Silesian Duchies Swedish idea 5: Swedish Absolutism Swiss idea 3: The Swiss Confederation Tibetan idea 1: Vajrayana Buddhism Tirhuti idea 6: Tirhuta Tokugawa idea 4: Metsuke Tumbuka idea 1: Maravi Influences Tupi idea 1: Agnatic Kinship Tverian idea 3: Patriarch of Tver Tyrone idea 3: Tanistry Venetian idea 6: Defend the Law Vijayanagar idea 3: Harsh Penal Code Wurzburgian idea 4: Independent Counts Yi idea 1: Strengthen the Yi Caste System Zambezi idea 2: Maravi Influences	Asakura ambition Bahmani ambition Garhwali ambition Garjati ambition Horde ambition Kaffan ambition Maratha ambition	Defensive-Economic: The Public Welfare Act

Note: The minimum cost to raise stability is 10 Administrative power.

Footnotes

↑ See in /Europa Universalis IV/common/static_modifiers/00_static_modifiers.txt (Static modifiers#Positive stability).
↑ See in /Europa Universalis IV/common/static_modifiers/00_static_modifiers.txt (Static modifiers#Negative stability).