But an index of needs would also account for differences in the requirements for living as the population becomes more urbanized and suburbanized ; for the changes in national defense requirements ; and for changes in the effect of weather on our needs 但是这个需求的指标同时也要在人口结构发生城市化和乡村化的变化时,在在国防和气候方面的需求发生变化时，能够区分它们之间的差别。
