4 ms·
I hate to be that guy, but the derivative should be d(GDP)/dt = d(Population)/dt * Productivity + d(Productivity)/dt * Population
by smnrchrds 9y ago
I hate to be that guy, but the derivative should be
d(GDP)/dt = d(Population)/dt * Productivity + d(Productivity)/dt * Population
- Analemma_ 9y agoI'll be that guy too: that's why I used ~ and not = ;)
- thaumasiotes 9y agoBut ~ is wrong, unless you're assuming that productivity is necessarily equal to population. It's not really right even then, because the ratio between GDP' and 2(Population') is not constant but rather equal to (Population).
- yufeng66 9y agoI will be that guy too then :) People tend to use relative change: d(GDP)/dt / GDP = d(Population)/dt / Population + d(Productivity)/dt / Productivity So the relative change of GDP is still neatly separated into population growth component and productivity component.