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econ.lerner-index Calculator
Calculates the Lerner Index of market power from price and marginal cost: (P – MC) / P. An index of 0 is perfect competition; 1 is pure monopoly — it measures how far above marginal cost a firm can price.
Inputs
Price
Current trading price. For bonds, rises when interest rates fall and drops when rates rise.
Marginal Cost
Profit as a percentage of revenue. Margin % is always lower than markup % — a $5 profit on a $15 selling price is 33% margin but 50% markup.
Market Share Pct
Reference formula or conversion factor shown for context.
Results
Lerner index
A normalised score comparing the result to a reference baseline.
markup over MC
Reference formula or conversion factor shown for context.
price
The computed or recommended price.
marginal cost
The total monetary cost computed for the given inputs.
interpretation
Qualitative summary of what the computed numbers mean in practical terms.
L = (P-MC)/P
Reference formula or conversion factor shown for context.