Big corporations are inefficient and lack accountability. Governments are like big corporations in that manner, but also can't be held accountable by the market.

Corporate monstrosities can get away with being inefficient insofar as they can stay out of the red overall. Governments can get away with being inefficient insofar as we are forced to continue funding them via taxation. Note: giant, unaccountable, inefficient corporations usually became so large through monopolies created through government force (i.e. regulation).