It is cheaper to buy from a convenience store

The prices at Pick 'n Pay are ridiculous! It is cheaper to buy from a convenience store that is open 24 hours a day than from a Pick 'n Pay supermarkets??. Chicken, pork, most vegetables, basics food stuff , and even tin foods are cheaper at 711. How can a supermarket with their massive buying power be more expensive than even Woolworths. Their BS physiological marketing and advertising is a joke. Their prices change daily, meaning they have no control over their supplier. I have marked their 'old stock', and the next day the same stock it is sold at a higher price. Not everyone is a ***** and we know how logarithms work; Push your price up by an additional 30% and if your sales don't change then keep the price as it is, if the sales go down, then offer the product at a lesser price as an advertised BS 'special'. All you 'Smart Card' holder are giving them all the information they need to charge you the maximum at all times. It is the consumer who dictates the price! No one, including share holders, are entitled to get rich from manipulating the public who are buying basic food stuffs.