View from several of economic declines in history, copper prices will definitely be affected to have a sharp drop along with the global economy, within which we try to summarize some of the laws. From a static perspective, the basic price of copper may have bottomed out, but from the dynamic view, the current cost of the global cumulative production line may falls down with the falling metal prices drop. (A very typical reason is that in a period of raising metal prices, the metallic mineral mining enterprises will have a marginal mine downward, as long as they can maintain a reasonable profit margin. So the mining cost will rise with the rising of mining prices and the downward of marginal taste. Meanwhile, the decline of metal prices will lead the enterprises to increase the exploitation taste in order to maintain a reasonable profit enterprise space and cash flow and to cut down the production cost.

Therefore, the current copper enterprises have a cost line of 75% and 90% which have a certain degree of guiding significance (especially in short-term), but it can not fully represent the long-term copper price floor. Copper price still have room for downward adjustment of the medium and long term.