Plus or minus two standard deviations where the standard deviations are calculated historically in a moving window estimation. Hence, the bands will widen if the most recent data is more volatile. If the prices break out of the band, this is considered a significant move.
A chart that indicates the trading range for the day as well as the opening and closing price. If the open price is higher than the close price, the rectangle between the open and close price is shaded. If the close price is higher than the open price, that area of the chart is not shaded.
One of two parts of a nations balance of payments (the other is capital account). It is a record of all trade, exports and imports, between a nation and the rest of the world. The current account is separated into merchandise, services, and whats called unilateral transfers. The merchandise part is nothing other than the well-known balance of trade. Theres also a lesser known balance of services -- the difference between services imported and exported.