I recall Ms. Romer defending her Keynesian-based economic failures once by saying (I'm paraphrasing)..."It's accepted economic theory, it's in all our textbooks, and it's what we teach our freshmen students."
There you have it. Since the Keynesian nonsense is in the textbooks that she and her contemporaries write, it must be gospel.
And, I have never met a liberal that did not believe to the very core that going into debt to do public works projects would get any economy roaring in no time.
Every last one of them cites the Hoover Dam and most will talk of the magic "multiplier effects".
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Spending is great if it's spent on a true investment. Building Hoover Dam is an example of huge government sized spending that has an actual return on investment. In most cases though government spending is the most wasteful kind of spending there is and has a negative return on investment. I don't think Keynes ever argued for destroying wealth. His ideas were hijacked by the left to justify envy driven confiscation and destruction of other people's money.