4.17 A unification bonus - example
Forming an electoral alliance (a pre-election coalition), can be beneficial for the coalition and for the parties within the alliance. The alliance can get more seats than if the parties within it run for seats separately - this is because some voting methods such as D’Hondt are superadditive.
Link: https://docs.google.com/spreadsheets/d/1b3etzZhjIKbVfXKrehmjRiR-l4zIkjEyOFsH87DqfgA/edit?usp=sharing
Remark: Sainte-Lague is not superadditive.