Positioning Strategies and their applications

There are many different types of positioning strategies. The most prominent are more for more, more for the same, same for less, less for much less etc. The best example of more for more strategy is that of Gillette Mach 3 Turbo. You pay more and you receive more product features and benefits. The example of same for less strategy is Walmart. You get good quality products which are offered in other supermarkets but at lower prices. A good example of less for much less are the differnt Desi book fairs in Anarkali, Lahore where you get books which are in a little battered condition but their prices are extremely low compared to normal bookshops. What do you guys think about these examples?