Called common gap is due to this gap often appears, also known as the gap region, but usually for finishing patterns, little significance on short-term technical terms. Often appear in inverted triangles and rectangles or order form, but in trading warm, upward gap in price is under intensive turnover formed. This gap often occur after price movements to form a consolidated bottom or top, due to the sudden political or economic events occur, so that the transaction price jump. Generally it believed that the general gap in future transactions will make up, that is, the gap left by the rising trend in the fall make up the future; the trend of decline, leaving the gap will fill in later. However, this is a general statement, not necessarily law. In fact, once the gap appeared, sharp price movement. The rise continued to rise, decline continued to fall, the situation often occurs gone, if not impossible to make up, often in a few weeks or even months later.