You can use a growth-share matrix like this to explain types of cars and where they would fit in the matrix compared to market growth rate and relative market share.
Text in this example:
Relative Market Share
HIGH
LOW
Stars
Question Marks
Cash Cows
Dogs
Growth-Share Matrix
Car Models Produced by Generic Motors
Ethanol-Powered Model
Hybrid Model
Affordable and Reliable Model
Market Growth Rate
Super Expensive, Relatively Unreliable Model