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when the aging physical functions are delayed, there would a lower national death rate. And when the death
rate becomes lower, there will be more people who pay the insurance fees and thus, the central insurance funds
and revenue would increase at a large rate. Putting in other words, when a nation’s income of health insurance
increase greatly, it means that a nation has received good results and effects of national preventive healthcare.
3.1.2 Stock-Flow Diagram
The Stock-Flow Diagram in this study is as followed (Figure 3).
Figure 3 Stock-Flow Diagram
First of all, we use strategy implementation rate, a variable, to start this model. Initially, the government plans
to promote nationwide sporting atmosphere and further enhance national physical strength. If physical
strength is increasing, there’s more chance to prevent from diseases and further decrease national death rate
and prolong the average lifespan. While the average lifespan increases, consequently there will be more people
to pay health insurance fees. Furthermore, this can reduce the accumulated health insurance debts of county