Although, 'product', in marketing terms, can mean goods and services, we are going to concentrate on goods. In a pure marketing sense, products themselves have no value.
The mix is a bundle of variables which are offered to the customer. These include the product or service itself (its advantages); its availability (the place where and when it is available, delivered or distributed); its image (the way it is promoted) and, of course, the price which should be charged.
Buying a computer in the post, petrol at a supermarket, mortgages over the phone and phones themselves from vending machines are just some innovations in distribution which create competitive advantage as customers are offered newer, faster, cheaper, safer and easier ways of buying products and services.