Perhaps I misunderstood your post. By saying 'made in Thailand' do you mean 'sold in Thailand'? If so, then it would be more reasonable to conclude that items here are more expensive.
As to your second point, no I am not expecting you to do a comprehensive survey. We have limited resources and limited access to data. What bugs me is that why is it people from other countries can retire comfortably at a 'decent' age but not here in Singapore? Unless of course you are very rich. It cant be because the cost of living is lower because I would assume that their salaries are lower and therefore their savings would be lower and there would be less in the bank once they retire.