If I was paid in bananas, what would be the value of those bananas that I would have to declare for taxes in dollars when the market value of dollars was zero?

If I was paid in bananas, what would be the value of those bananas that I would have to declare for taxes in dollars when the market value of dollars was zero? And how many dollars would I need in order to pay taxes on that income? edit: forget that, you are right, of course - I guess it's not a good idea to treat infinity as a number ;-)