[qcnguy]

In a Parliamentary system there needs to be either one party with a majority or a coalition that agrees to rule as one party. If one party wins a clear majority it is rare for a government to fail to pass a budget or collapse early, as it'd require the party to turn on itself. In coalitions bitter parties can indeed force early elections and it happens all the time. It's the reason European countries have such unstable politics and frequently experience government collapse, "caretaker governments", "firewalls" and long delays after an election before a government can be formed.