I was going to say it's pretty common not to have the major city (largest finance/population/GDP, pretty much all correlates of one another), but it's actually not. Excluding countries that explicitly moved their capital from the largest city (e.g., Brazil), the major countries with this setup are Australia, Bolivia, Cameroon, Canada, Ecuador, Morocco, New Zealand, South Africa, Switzerland, Turkey, UAE, US, and Vietnam. And most of those countries boil down to "we took several regions and agglomerated them into one entity," where the capital is either unchanged from one of the old constituents (e.g., Turkey--Ankara was the capital during the Turkish rebellion) or was sited in a middle point to not favor one constituent (e.g., Canada).

It's just that I'm more familiar with the exceptions than the rule.