Marginal Analysis
Updated 2026-08-15
INTRODUCTION
English translation pending.
CORE DEFINITION
Marginal analysis examines the change in benefit or cost that comes from adding one more unit of input. It rests on three ideas: diminishing marginal returns, under which each new unit adds less output than the one before it; marginal utility, the satisfaction gained from one more unit consumed; and the optimal decision point, where marginal revenue equals marginal cost. The key condition is that the decision is made one unit at a time.
SCAFFOLDING EFFECT
Reduce cognitive load
- Think in increments: judge the next unit rather than the total or the average. - Find the stopping point: keep investing only while marginal benefit exceeds marginal cost. - Spot the diminishing returns: notice when each extra unit buys less than its predecessor.
Anchor fast decisions
What determines the best action is the comparison at the margin, because past costs are already sunk and totals cannot tell you whether the next unit is worth taking. The optimum sits exactly where marginal benefit and marginal cost meet.
MINIMUM ACTION
In progress 0/1Practice this model in one real situation:
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Source support: Explicit
- zh.wikipedia.orghttps://zh.wikipedia.org/wiki/%E8%BE%B9%E9%99%85%E5%88%86%E6%9E%90%E6%B3%95verified
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