在金融市场摸爬滚打的人已经忘了什么是价值，技术指标是他们的语言，他们并不清楚那些技术分析背后的道理，不过他们觉得很有用。其实技术分析不需要什么道理，只要相信的人多了，就自然成真了。譬如用均线来确定支撑点，只不过是为了有一个大家都公认的点位来达成共识而已。这有点像聚集吞拿鱼的FAD（fishing aggregating devices)。

下面这一段摘自wikipedia：http://en.wikipedia.org/wiki/Fish_aggregating_device


Fish are fascinated with floating objects. They aggregate in considerable numbers around objects such as drifting flotsam, rafts, jellyfish and floating seaweed. The objects appear to provide a "visual stimulus in an optical void",[2] and offer some protection for juvenile fish from predators.[3] The gathering of juvenile fish, in turn, attracts larger predator fish. A study using sonar in French Polynesia, found large shoals of juvenile bigeye tuna and yellowfin tuna aggregated closest to the devices, 10 to 50m. Further out, 50 to 150m, was a less dense group of larger yellowfin and albacore tuna. Yet further out, to 500m, was a dispersed group of various large adult tuna. The distribution and density of these groups was variable end overlapped. The FADs were also used by other fish, and the aggregations dispersed when it was dark.[4]