Would like assistance debunking a Keynesian article

Hello everyone,

I am involved in an ongoing debate with a co-worker, and he has provided the following article for me to review:

I am constructing a paragraph-by-paragraph response and would greatly appreciate any input. If you have any particular insights, suggestions, or arguments that I should include, please let me know. Links to articles that address certain points would also be great.

I’m not asking for anyone to fight my battles for me, I’m simply making sure I give a sound and well-reasoned argument.