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[Econ] econ marginal 一問

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econ marginal 一問

can anyone help me with this concept of Marginal benefit and marginal cost with graph?
When goods or activities areperfectly divisible, the rule is
do the additional∆ unit of activity X if and only if
MB(additional∆ unit | Q units) ≥

MC(additional ∆ unit | Q units)
Let∆ approach zero, the rule becomes
MB(additional ∆ unit | Q units)  =
MC(additional∆ unit| Q units)
   
Phy Chem Bio:)

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In short, just do the additional activity iff the benefit of doing that is larger than the cost.

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