It diversifies manufacturer risk. A portfolio of car offerings (or stock purchases) will mitigate overall risk because when some models (or stocks) are popular others, by definition, will be unpopular thus leveling the future income stream making it more predictable and stable.
I want to get my twin nieces books for their upcoming vacation and want to pick something classic, before 1960, but fun. These came to mind:
Little Women
Black Beauty
To Kill A Mockingbird
The Pearl
Huckleberry Finn
Suggestions?