The Question and Answer section for Outliers is a great resource to ask questions, find answers, and discuss the novel.
In Chapter Two, Gladwell's purpose is to highlight the importance of birthdays. He explains success as having more to do with luck and practice than anything else.
The "theory" of the "Matthew Effect"?
Gladwell contends that there should not be cut off dates to when children can join a club or a sport. Gladwell contends that Kids that don't make the cut-off date within a year do poorly compared to the children that do make the cut-off date.