Big Mac is the classic index that many use. I think it is a common product that many countries have and so becomes a common comparator. In many countries, of course there are other cheaper alternatives and healthier alternatives than Big Mac. I have at least hot pot freedom[Grin] but i do see freedom as the choice to choose given the income. In life, there is more than just food as there are also many other expenditures. In Singapore, buying a house and car are often the most expensive purchases. So, consumer index might be a fairer comparison across countries as many people definitely need to consumer services too. There are also alternatives such as iPhone and kfc index to account for the different prices of raw ingredients and preference. So, maybe, for comparison across countries, the different indices need to be used to see how the differ and maybe consider an average for comparison.