What is a product market AND how do I choose a product market . Pls help quick

Product markets typically contain groups of consumers that share a fairly specific need that only certain and closely related kinds of products or services can meet. In the case of smartphone users, for example, only phones with specific and more or less comparable capabilities can serve the needs of these consumers. In a product market, the capacity to serve the market is often predicated on the method. Only a company that produces smartphones can compete for this market, let alone hold an intrinsic advantage, because only that product suffices.

1   b) the use of non-standard grammar  

2   a) quiet and shy.