I was recently asking about the large coalitions (5+ parties with members in the government) and I was wondering how do they manage to get stable governments with so many parties that have rather different ideologies.
Let's take Finland's example and the following coalition (ideologies also mentioned):
Social Democratic Party -> Social democracy Centre Party -> Centrism, Liberal Conservatism, Nordic agrarianism Green League -> Green politics, Pro-Europeanism, Social liberalism Left Alliance -> Democratic socialism, Eco-socialism Swedish People's Party -> Social liberalism, Swedo-Finnish interests
Taking a look of the governments list all of them are formed through large coalitions and pretty stable (6 governments in about 10 years).
By contrast taking a look upon Romanian government list, current President alone has observed about 6 different governments and he has just been reelected as a President. What's more, in Romania's case the coalition is typically composed of 2-3 parties.
Question: How do large party coalition manage to ensure government stability for a fairly long period of time?