I would imagine in the fridge example that results in a product category. In the ice cream example, the carts would move as far possible towards the middle unti

I would imagine in the fridge example that results in a product category. In the ice cream example, the carts would move as far possible towards the middle until the incentive is no longer an incentive. They're already in the middle, or going any closer would lose rather than gain customers. But afaict the general idea still holds, theres an inherent incentive to move to the middle (which ofc can be defeated by competing incentives but nonetheless)