product differentiation, n.All

Product differentiation (n.) is ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠how oligopolies avoid price wars: spend fortunes on advertising so that near-identical goods seem to differ.