A closed party system is one in which the political competition in an area remains restricted to a fixed number of parties. What often happens in such systems is that even while competing with each other, the political parties often collaborate to keep the system closed and prevent the entry of new players.
For the past couple of decades, Punjab has been operating under exactly such a system, in which power is essentially divided between the Shiromani Akali Dal-Bharatiya Janata Party combine on one hand and the Congress on the other.

