at the heart of porters 5 forces, profitability is more likely when rivalry is less intense. where the intensity of rivalry is high, pressure to maintain low price and thus keep costs low to still make a profit is great. where rivalry is less intense, non-price competition on marketing, branding or innovation is more likely. low - few companies dominate market, high barriers to entry, no direct competition from abroad. high - many undifferentiated products, slow market growth, low capacity utilisation, low barriers to entry