Answer:
do ur own coursework
The simple answer to that question is that they dont.
Having joined the firm in the early 1970s as a signwriter I soon found that certain 'practices' where already well established.....like 'price buncing'. Put simply ..head office would issue us with a list of current prices for all items in stock but they seldom went any further than that. On arriving at a given shop we would find out from the manager how much that store had lost due to thefts,breakages,or damage. We would then calculate how much we could get back by adding a penny here and two pence there on all items for sale. This is 'buncing' the articles price.
Tesco knew what we were doing but as long as they were making money they turned a blind eye. They knew that by reducing the price of some items while hiking up others always works because shoppers rarely go into a store to be just the reduced items....they go to purchase their weeks shopping which means what they make on the reduced items they loose on the bunced articles...and more.
So be wary of shopping here....nothing is as it may first appear.
'Every little helps' is a fitting logo when it is applied to this firms profits margin.
Needless to say...I left.