All successful products go through a life cycle, from the introduction into
the market, gradual growth in sales, a period of maturity when sales are at
a maximum, through gradual decline as the consumer tastes change or new
products come on to the market to replace it. In some cases, a product can
be diverted from its decline if new markets are found, or the product is
modified or diversified in some way to attract a new customer base. The
following graph shows the progress of this life cycle over time.