范里安第九章中说到价格变动,其中说到如果商品1的价格下降,预算线就会比较平坦,但是为什么预算线一定要绕禀赋点转动呢?
也就是说为什么禀赋点一直在预算线上?请指教
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writing out the budget constraint function, you will find the endowment point always satisfies the equation.
Endowment point is the initial given point.
No matter how the price changes, it will not affect the original possessions.
The original Endowment will always on the lines.