basic economic reasoning is based on ceteris paribus, but you are assuming everything else changes at the same time. Clearly, this violates the  basic principle of ceteris paribus. hope this helps.

就我提到的那个案例并不是假设变化的太多，而是最重要的历史因素排除在外，然后用历史因素导致的现象：储蓄低投资也低来证明该模型正确，证明所以美日国家收入高