How valuable would America's currency be if it was zero interest?

If America the United States and it's confederates, really: were to create asset with any surplus such asset investment would be deemed as public wealth. to ensure any debt your citizens have is covered. The value of a currency known to be 1 value would usurp all others. At no interest rate. It'd be great the obvious excess could be used to form a trust fund with the citizen as the payee. 50$ a day per citizen is the goal