[tryptophan]

Poland also has proportional representation. A 40% party will need to coalition with other parties if it wants to have enough votes to rule.

[pzduniak]

Except votes for parties who get less than 5% (if running alone) or 8% of votes (if a Coalition) do not count. So that 40% becomes 52% and suddenly the only thing you can do as a minority party is yell.

[tryptophan]

Rules like that aren't uncommon.

Netherlands is like the one exception that doesn't require parties to win >4-5% of the vote to get into parliament.

And all of these systems are more democratic than what the USA uses.