Give an acount of the main factors that explained the changing nature of competition in the snack foods up until the late 1970's.Discuss the nature and causes of any changes in the competitive conditions of the industry since then.

By European standards the British spend higher than average amounts on both savory snacks (principally crisps) and breakfast cereals.Snack foods are a central part of most weekly shopping trips for most consumers,although bagged snacks are a relatively new development.
The potato crisps particularly had played a significant role regarding the English eating habits since 1950's they have been a part of their lifestyle and English tradition.Nowadays potato crisps are the most frequently eaten and the great success of that particula...