A product, I should prefer to say, has a period of production n if n time-units of notice of changes in the demand for it have to be given if it is to offer its maximum elasticity of employment.

我宁愿说，如果要提供最大的就业弹性，就必须给出 n 个时间单位的需求变化通知，那么产品的生产周期为 n。