He mints coins in a quantity he determines "sufficient to meet demand."
He could just say, "demand fell off a cliff since inflation is so bad, everything is so much more expensive."
By the time Congress figures out what happened and that Geithner is full of excrement (you always have partial dollars, no matter what the price) merchants will have adjusted to rounding their prices and prove Timmy Boy right. (fake it till you make it)
The Daily Paul