What are the four common forms of market development strateg

A market development strategy targets non-buying customers in currently targeted segments。It also targets new customers in new segments。
A marketing manager has to think about the following questions before implementing a market development strategy:Is it profitable?Will it require the introduction of new or modified products?Is the customer and channel well enough researched and understood?
The marketing manager uses these four groups to give more focus to the market segment decision:existing customers,competitor customers,non-buying in current segments,new segments。