I see reports like this one and question them.  The link goes to a summary page which in turn links to the actual study spanning 2,670 pages.  Ouch.  Outside the root moral issue of expropriating personal wealth via taxes to spend on goals chosen by political rather than market forces, where would a person begin to examine a study like this one objectively to determine its degree of truth, arbitrariness, or falsehood?  Is venturing beyond the root moral issue even worthwhile?  Presumably a "multiplier effect" is at play here, but I have never really understood that concept, either.