"We've seen a very deep change in the dynamics of price movements," he said.

Based on price movements, that sort of trade has not yet taken place.

This means future price movements cannot be predicted by using past prices.

"This is probably why today's price movement was generated on such little volume."

So wild price movements do not seem to be a rare event.

Based on price movements, that view was not prevalent in the market yesterday.

Still, the odd price movement in the summer struck many as suspicious.

The first spread is used where small or no price movements are expected.

Consequently, if someone does have a big program trade one way or another, you could see more price movement than would normally be expected.

The price movement that followed the reports came on extremely thin trading.