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It's also important to remember that when you fly commercially, you will almost always either be on a Boeing or an Airbus model as the plane-making industry operates as an effective duopoly.

PiS, led by 75-year-old Jaroslaw Kaczynski, and Tusk's PO are the two parties that have dominated Polish politics for the last 20 years and some voters are fed up with the duopoly.

Human rights lawyer Malgorzata Szuleka agrees there is fatigue, both with the duopoly and Tusk government's failure to deliver.

The demolition of the duopoly in Westminster politics has been talked of before.

All the world’s conflicts and conclaves were seen, sometimes simplistically, in the context of this duopoly.