行业分类 Sector Rotation ■用经济周期中的阶段来选择行业界线 Selecting Industries in line with the stage of the business cycle ■波峰自资源公司Peak- natural resource firms ■合同-防守性公司 Contraction- defensive firms ■波谷-设备,交通和建造公司 Trough-equipment, transportation and construction firms ■膨胀-周期性行业 Expanding -cyclical industries17-17