Eli Lehrer informs me that Tide has a high market share even though it is more expensive than most other brands. This source says the market share of Tide is about forty-four percent, with the sum total of all Proctor and Gamble products (Gain and Cheer are two others) accounting for about two-thirds of the market. Is Tide so good? Does Tide really "know fabric best"? I couldn’t name one supposed feature of the product and I’ve been buying detergent my whole life. I couldn’t even tell you what brand I buy. Maybe it is Tide. This is the kind of question that Wikipedia isn’t much good for.