I believe that in many Asian states the relationship between foreigners and local residents includes two types of economic treatment. Personally I think it ALWAYS WRONG but I must say that lately, hospitalized in a hospital in southern Thailand for an operation, I was asked to present my tax return to the Revenue Department and upon delivery of this document the price that was applied to me it was that of the Thai people. So residents who pay taxes in Thailand can access Thai rates. And this, if applied all over Thailand in private or government hospital, IT SEEMS VERY JUST TO ME. Tourists come with insurance stipulated in their country and residents who pay taxes here have Thai rates.