I’m not sure, however, that per capita GDP is the best indicator of prices. The problem is that GDP doesn’t take into account the value of a currency and other cost of living factors, like availability of goods and services. For instance, I imagine the very poorest countries like the Democratic Republic of Congo or Haiti would be much more expensive than Thailand or Vietnam. Of course these are extreme cases and generalities tend to break down at the margins.

It’s an interesting theory though, and I’d be interested to see how closely related cost of living (and travel) is to GDP per capita.

I have live in several places in China. In some my costs easily exceeded your estimate, in others I only used half your stated amount and drinks were already included.

I think a better estimate in general is to look at the GDP of a country as a guideline and then check the city you want to go.

Oh, not to mention that multi-million travel site …