It all depends on the precision you need. You could use an infinite series to get to the precision needed but for most use-cases it’s just a double baked into the binary itself, hence O(1)

I’m more of a long-term support male myself

Could just be a story about a man getting pegged by his wife

Plus it also means that the government has an actual incentive to keep the insurance companies honest

Well yeah but percentage of GDP is just the total spent. The point is that the USA relies primarily on employers paying for the insurance (through a pay cut) whereas in the EU it is generally subsidised with taxes. Which, if you tax fairly, means that the cost of healthcare is better for the average worker (e.g more based on how much any individual earns)