The New Yorker magazine surmises that brands are losing power and each item offered by a brand must prove its worth:
(excerpt:)
"...if a car was made by G.M., or a ketchup by Heinz, you assumed that it was pretty good. It was hard to figure out if a new product from an unfamiliar company was reliable or not, so brand loyalty was a way of reducing risk. As recently as the nineteen-eighties, nearly four-fifths of American car buyers stayed loyal to a brand.