As someone who teaches, and someone who likes economics, and as someone that is gay, I find this more than slightly disturbing:
I could point out the obvious flaws in his argument(s) - though "flaws" are really too weak a word here - academic dishonesty is more like it. Or I could point out the number of obvious economic net benefits of wanting to accept gay "lifestyles" (and by "accept" I mean not having the State treat them/us as third class citizens or to have to live in fear of fellow man) as opposed to just opposing it and hoping the "lifestyle" goes away.
But I won't. I'll just let you read and soak in the fact that I received my B.S. in economics from the same institution that that this Dr. Bert Chapman now teaches.
I guess Purdue lets anybody teach nowadays.