> If you give five dollars to someone who is starving and standing next to a McDonalds, he can derive a lot of practical utility out of that five dollar bill. If you give five dollars to Jeff Bezos, it has utility approaching zero.

> In your own life, this is also true.

I'd argue these are different, and the first claim is wrong. It seems intuitive and many economists claim that $5 don't mean as much to a billionaire as to a poor man, but the Austrian school of economics argues this is a nonsensical claim.

You can claim that you prefer $5 to a hamburger, but it doesn't make sense to say you like $5 more than I like $5. Does it make sense to say you like your grandmother more than I like my grandmother? It's not wrong, it's just nonsensical. You cannot compare interpersonal preferences.

You can compare intra-personal preferences - maybe you like your grandmother more than $5.