Firm Sales Appel Computer 1000 Banana Computer 800 Cumquat Computer 600 Dellta Computer 400 Endive Computer 300 Fettucini Computer 200 Grapefruit Computer Hamburger Computer 150 100 InstantCoffee Computer Jasmine Computer The Herfindahl-Hirschman Index (HHI) is defined as HHI = (market share of firm 1 in %)² + (market share of firm 2 in %)² + ... + (market share of last firm in %)² 50 1