You seem to be mixing two topics. One appears to be a complaint about purchasing power between tourists and locals, and the other about US domestic purchasing power on minimum wage.

You’ve got lots of great answers by others on the latter and how it is unsustainable as a living wage. Why Americans (and likely other Western tourists in general) consider certain countries “cheaper” is because of exchange rates. That would be a whole post on it’s own.

A single US Dollar (USD) can be used to buy about 93 Indian Rupees (INR), as an example. The average monthly wage is something like 25,000 INR, so even minimum US federal wage would be 5x more monthly buying power (but as explained by others, minimum wage earners are not the ones traveling). “Cheap” is used to compare against a similar purchase in their home country and what it would have cost there. It is not an insult but a way to describe the difference in cost relative to income.

The one that basically started it all!

Technically, zero… If you don’t mind not posting that is, libredirect is an option.