Causal Relationships

It shows that the graph of the use of leaded gasoline between 1937 and 1986 is similarly shaped to a graph of violent crime between the years of 1960 and 2009. The authors of the article argue that this shape similarity could imply a causal relationship. Do you agree or disagree? What other factors might play a role in this relationship? Please remember to comment on at least one other student’s post.