I live in Australia which has a preferential voting system, and yet two parties dominate for the most part.
There are electoral-related reasons for this but also there are branding/marketing reasons that make it more likely that large parties continue to dominate.
It's easier for large brands (parties) to hold mind share. It's very hard for minor parties to build a brand built around anything other than opposition to specific things or outrage.
I live in Australia which has a preferential voting system, and yet two parties dominate for the most part.
There are electoral-related reasons for this but also there are branding/marketing reasons that make it more likely that large parties continue to dominate.
It's easier for large brands (parties) to hold mind share. It's very hard for minor parties to build a brand built around anything other than opposition to specific things or outrage.