It's not more relevant, because disposable income ignores things Norwegians get 'free' (because it is already deducted).

Part of that 'deduction' pays for heavy tax-breaks and subsidies for electric cars in Norway.

But then GDP is also an abhorrent metric to use for basically anything.

If you use either GDP or 'disposable income' as a proxy metric to compare anything between countries, you should seriously re-evaluate what you're doing.

Teslas cost more (after those tax-breaks and subsidies) in Norway than in California. You're lacing the conversation with a lot of value judgements, but those aren't particularly relevant to the question of whether the people of California or Norway are more able to buy Teslas.

I don't have to re-evaluate anything. I just wanted to tell OP that Norway is a very rich country and not in any way poorer than California.