On the surface it appears that prices in a free market with perfect competition should be arrived at by the free actions of willing buyers and sellers; any deliberate protectionism, monopoly, profiteering or collusion will cause abnormal price fluctuations and are full of dangers.
表面上看來，處於完全競爭下的自由市場價格，應是買者賣者一個願打一個願挨的自主行為；各種人為刻意的保護、壟斷、炒作及聯合行為，則會使物價波動異常、陷阱遍佈。