Given your username it appears that you may be an Austrian in your economic views. Citing one paper that purports to dispute one paper of Cowen hardly qualifie

Given your username it appears that you may be an Austrian in your economic views. Citing one paper that purports to dispute one paper of Cowen hardly qualifies as enough evidence that he has no credibility on economics. Perhaps a bias in you is at work and that this bias leads you to your claim.