Ben Paynter in New York Magazine:

Shoppers have surprisingly strong feelings about laundry detergent. In a 2009 survey, Tide ranked in the top three brand names that consumers at all income levels were least likely to give up regardless of the recession, alongside Kraft and Coca-Cola. That loyalty has enabled its manufacturer, Procter & Gamble, to position the product in a way that defies economic trends. At upwards of $20 per 150-ounce bottle, Tide costs about 50 percent more than the average liquid detergent yet outsells Gain, the closest competitor by market share (and another P&G product), by more than two to one.