Marketing comes much later in a Product Life Cycle. First you have to identify the need, then you have to design a product which satisfies that need, then you need the capability to manufacture that product after which you need the capacity to be able to sell the product to the wholesale and retail chain. After this comes marketing which is a support for all that has gone on before to ensure the existence of the product is made known to its Target Audience, and it suitably packaged and advertised so its adopted and both the consumer and the marketeer benefit. To cut a long story short, its not just marketing, its an overall grasp on the pulse of the environment.
