Other contributors have said "Stages of product life?" is the same question as "What are the four stages in product life cycle?" If you believe that these are not asking the same thing and should be answered differently, click here
The 4 stages in the product life cycle are: 1. Introduction 2. Growth 3. Maturity 4. Decline In that exact order. However keep in mind that each specific product can be in a different PLC stage in...