Assorted links by Tyler Cowen May 8, 2013 at 12:04 pm in 1. Arnold Kling on why centralized states are better than clans. And is Haiti now open for business? 2. What can be done to improve struggling high schools? (pdf) 3. Will the slowdown in health care cost inflation persist? 4. Who are the reformist conservatives? 5. Nature symposium on GMOs, and the causes of the human genetic bottleneck seem to be truly unknown. 6. Meg Greene on negative interest on reserves. I used to think that was possibly a good idea, but now I do not. Addendum: Scott Sumner responds.