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where does he say free healthcare is bad in the book? He talks at length about the American healthcare mess and what is wrong and could be done there, in America where non-privatised healthcare will never happen. As far as I recall he mentions nothing about trade unions, he talks exactly why sweatshops are not good but better than the alternative (as many economists including Krugman have tried to explain to people for a long time) which is subsistence poverty at best. You also seem to ignore the sections where he addresses the problems of completely free markets and suggests remedies including sometimes establishing a market and others externalities taxes

Secondly free healthcare is never free it is paid by tax payers. I'm a supporter of nationalised healthcare but you have to remember it is not free. You mean free at point of use like the NHS (which Harford makes no comments about).

he mentions quite a lot about trades union in the part about trade protectionism - in that saving local jobs are bad and so trades unions are bad. Frankly I don't buy the "sweatshops are better than nothing" argument, although I am at a bit of a loss as to how to fix it all.
He seems to prefer the Singaporean version of healthcare which is basically the free market backed by government funding but not in a European way. I was ok reading this until I got to the sweatshops then I really had to grit my teeth to get through it.

I mean I don't think we should enslave doctors either. Do you?