Using Walkers crisps as an example describe the role of promotion within the marketing mix?

The 4 p's of marketing mix are price, product, place and promotion.

Product: Walkers crisps or any product that they sell. Does it have a unique selling point?

Place: huge supermarkets e.g. ASDA, TESCO, Sainsbury, vending machines, to wholesalers and retailers

Price: multipacks of crisps. psychological prising e.g. £1.25, £0.90

Promotion: TV adverts, billboards, paid ads,

-special offers, selling crisps cheaper than other companies.