Maintained Markup (MMU)
Maintained markup (MMU) is the margin actually realized after markdowns, allowances, and shrink — the gap between net sales and cost of goods, as a percentage of net sales. It is what survives of the initial markup once the season has played out.
The spread between IMU and MMU is the season’s erosion. A high IMU with a low MMU signals heavy markdowns — usually traceable to the buy and the size curve, not to pricing.
MMU is the margin a merchandising plan is ultimately judged on.
See also
RetailNorthstar puts these metrics where planning decisions happen — connected to one plan, live against actuals.
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