[Zababa]

All good points. The original article has a few things that are oversimplified I think, which is why I criticize it a bit. For example, if you go from a country in the EU to San Francisco, you're going to earn way more but spend way more too. But if you plan on going back to the EU when you retire, this won't matter much because your living expenses will drop.

I don't know how hard is doubling your income in general, but I don't know if it's always harder than dividing by two your expenses. The thing is that by focusing on earning more, you will end up with more money, and at that point you can always cut back expenses. While if you focus on cutting back expenses, you will end up with less money.