Multi-branding is marketing of two or more similar and competing products under different brand names by the same firm. Unilever, the Dutch-British transnational consumer goods company, produces several worldwide brands, including detergents, deodorants, soaps, and toothpastes. One of their washing powders in the United Kingdom is sold as both Surf at \(£ 7\) ( 45 washes) and Persil at \(£ 8\) (45 washes). Give an asymmetric information explanation as to why a firm might use pairs of brand names and why one product might sell for more than the other does.