If you want your comparison to be equally valid wherever you make it, you have to use the same basket of goods everywhere you go. Otherwise, I can't tell whether you are comparing apples to oranges or pears to grapefruit.
When I look at the numbers for that basket of goods that I currently consume, and price it out for San Francisco, I find that it is completely unattainable for anything less than 3 times what I currently pay, and could be difficult to reliably source for less than a multiple of 4. That's the fact.
It does not matter that I would in reality have to substitute down to inferior goods. It would still be objectively worse than what I have now. The value of my willingness to substitute counterbalances the savings I make by substituting. If I move back to the cheaper area, I won't keep the SV basket; I will substitute right back to the best goods that I can afford.
When I look at the numbers for that basket of goods that I currently consume, and price it out for San Francisco, I find that it is completely unattainable for anything less than 3 times what I currently pay, and could be difficult to reliably source for less than a multiple of 4. That's the fact.
It does not matter that I would in reality have to substitute down to inferior goods. It would still be objectively worse than what I have now. The value of my willingness to substitute counterbalances the savings I make by substituting. If I move back to the cheaper area, I won't keep the SV basket; I will substitute right back to the best goods that I can afford.