Author here. Ask Me Anything.
Maybe the most important conjecture in the whole thing is the one that isn't backed up; that optimists are in fact more likely to be successful (in any sense of the term). Is there factual basis to that claim? A healthy sense of dread and paranoia can be useful (if not fun). Obviously demotivating depression isn't helping anyone, but I don't understand why, prima facie, optimists ought to be "better at stuff" than pe…
A: That you can measure optimism;
B: And that it correlates with performance;
C: That cognitive therapy can increase optimism;
D: That the increased optimism correlates with increased performance.
He published his studies, but I have not reviewed them, I am just repeating the claims from his book.