美国的“新经济”已经给美国带来了战后最长的景气周期。目前美国经济已经出现下降的征兆，新经济开始受到普遍的怀疑。那么新经济是否真正存在？新经济是否存在商业周期？如果新经济存在周期，那么与传统的周期有什么区别？ The “new economy” in the United States has already brought the longest period of post-war economic boom to the United States. At present, the U.S. economy has seen signs of decline, and the new economy is beginning to receive widespread suspicion. Then the new economy really exists? Does the new economy have a business cycle? If there is a cycle of the new economy, then what is the difference with the traditional cycle?