They don't know/understand the basic economic problem "limited resources to meet unlimited demand"
If there was a infinite supply of items then no one would make any profit, thus the market would be used a lot less.
To be honest Galt I think it would only be you and I who could actually talk economic theory and unless you are taught otherwise or you have your own separate opinion, then most likely it would be a discussion rather than a debate, unless we got onto ethics, inequality of income distribution etc.