1 dataset available in Martinez
The HHI Monopoly Index for San Francisco-Oakland-Fremont Metro Area, CA, US
--HHI Dominance-- Near-monopoly positions in their local market. Businesses that mathematically "own" their local market (>30% share) with high HHI contribution of >900 within 1km. Safe, cash-flow-heavy bets that competitors can't easily dislodge.