Procter & gamble's tide laundry detergent has a predominant share of the detergent market in the united states. It makes $4.5 billion in sales of this detergent brand. However, the detergent market has reached market saturation in the united states. With this information, what type of product is tide based upon the boston consulting group's market growth/market share matrix?
a. Dog
b. Cash cow
c. Star
d. Pig
e. Question mark