Where a market moves directly from one correctly quoted price to another, significantly different, correctly quoted price.

There can be many reasons for gapping: economic figures; company announcements; political events; natural disasters etc but the effect is that any fill on a stop loss, limit or new order may be at a different level from that requested by the trader.

The total value of goods and services produced within the borders of the United States, regardless of who owns the assets or the nationality of the labor used in producing that output. The growth of output is measured in real terms, meaning increases in output due to inflation have been removed.