Food grocery is widely discussed as an example of a competitive oligopoly.
The chart below shows the changing market share for the major grocers over recent years.
The dominance of Tesco as the leading retailer in the UK has been challenged. In part this comes from the rapid growth of deep discounters such as Aldi and Lidl who in November 2014 had accumulated an 8.4% market share, up from 6.95 in the autumn of 2013.
Supermarkets use a full range of price and non-price competition strategies to grow and protect their market share:
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