Ah, the million-dollar question! But seriously, it's hard to pin down an exact figure.
The Bitcoin market is influenced by a variety of factors and is traded globally 24/7 on many different exchanges. This makes it somewhat unique and fairly complex compared to traditional markets.
A sudden increase in price could be caused by a large buy order (or series of orders) that quickly eats through the sell wall on a particular exchange. However, given the global nature of Bitcoin trading, this would need to happen across multiple exchanges nearly simultaneously for it to have such a notable impact.
So really, we're talkin' about potentially millions or even billions "dollars" depending on market conditions at any given moment. And remember - anyone who tries to tell you they can predict these things with certainty... well, take that with a pinch of salt!