True, but you can only know the potato through experience, which is subjective. The same potato could be highly valued or totally disposable based on how hungry or poor you are.
Discussion
what has more objective value, potato or ounce of gold?
am I alone and hungry, or able to trade?
the value becomes subjective
I can point you to Keonnes dilemma with the Mackerel standard , as an example. And they still dont eat them.
eat the chicken, spend the mackerel, Gresham's law in action
Sure but it’s still a potato. Things either are or are not.
We come to these conclusions using input processed through faulty hardware. When you say "potato", the neurons in your jar brain can only draw from your subjective experience of what a potato is. When someone else hears you say "potato", they can't possibly be experiencing the same platonic form of a potato as your brain. You are both experiencing different potatos.