Is this a troll question? Ofcourse btc is not bigger than usd that would be crazyness and btc would be way higher in price right now than it is.
Bitcoin is bit but not that big yet by far. We need more advertisement around the whole digital currency idea for it to get more big.
bitcoin have higher price does not mean bitcoin has greater power than the dollar? yeah until whenever the dollar will be more superior than the bitcoin. yeah it's like a very funny question, surely everyone would prefer dollar than bitcoin