I can understand why the confusion exists. Public finance (government intervention in the economy) is a couple of full time courses in economics.

The basic principle is that "market" forces are those inherent in the interaction between the "suppliers and demanders"...where government intervention is "enforced" on the market from the outside. Both have influence on the derived outcome of the market...so the net effect is pretty much the same. So...

...I understand both points of view...but to really be true to my school...have to split laws and other government issues away from the naturally occuring "market".