What it means in plain language
MPI of 100 means you captured your fair share of demand. 110 means you outperformed; 90 means you lost share. MPI alone doesn't tell you why - you can win MPI by undercutting (low ADR) or by being preferred at parity. Always read with ARI (rate index) and RGI (yield index).
How Market Penetration Index fits in the bigger picture
Market Penetration Index doesn't live alone - it sits inside the Metrics & KPIs category and connects to 3 closely related concepts most working revenue managers track in the same breath. Pair this definition with the related terms below to build a working mental model - definitions in isolation are easy to memorize and easy to misuse.
Related terms you should also know
Each of these is one click away - start with whichever you don't already use daily: