Scenario 0) I do nothing, get nothing.
Scenario 1) The government gives me $1000 and I buy $1000 dollars worth of goods and services, so now the economy is better by the net gain of $1000 worth of transactions - i.e. the mutual benefits of trade.
Scenario 2) I have a job, do my job and my employer pays me $1000 dollars. Then I spend that on $1000 worth of goods and services. Now the economy gets the benefits of $1000 worth of trade plus everything that I did for my employer, which is in excess of $1000 according to his calculation.
You compared Scenario 1 to Scenario 0 and said that Scenario 1 is a win, but the context was 1 versus 2, where it's a negative. In scenario 2, the employer could be the government paying me to improve the roads, for example, instead of the government handing me the money they would have paid me. In which case the difference is the improved roads.
Perhaps corporate profits would not have to be so huge and prices could be lowered if the pay for work done was more closely related to the value added.
For that matter, how about all the jobs that nobody necessarily "wants" to do, are low paid, and yet critical to the functioning of societies?
So the benefit of giving that money must provide a gain greater than the deadweight cost. That gain could be non-monetary (a mom raising her kids for example) -- but just the 'spending' doesn't benefit the economy because spending $500 actually cost much more than $500.
Unfortunately taxation itself reduces the incentive to produce and distorts the economy, and the Broken Window Fallacy is still a fallacy.
(BTW, Hacker News is simply terrible at discussing economics. This comment is hardly unique.)
> Broken Window Fallacy
The entire thread and discussion is a bit off-putting but it's worth noting that the question is, as always, what to do about unproductive assets. Nobody is advocating that healthy, able-bodied people should all receive free money from the government. That's why the Broken Window Fallacy is stupid. It's a fallacy against a straw man.
And yes, when it comes to unproductive assets there's good reason to believe that the government should step in and act as the "producer of last of resort." There's always work to be done. The government is never going to run out of money. And, in reality, you're going to end up giving these people money anyways (unless you want to see women and children starving the streets) so you might as well try to see some returns. I've never been a fan of basic income but a Job Guarantee[2] makes perfect sense. Finland would be far better off putting these people to work for the government. Basic income in this form (giving people free money while encouraging them to go to work for private producers) can, ironically, depress wages, unfairly subsidize badly managed firms, and ultimately hurt the economy. Unfortunately westerners are terrified by the spectre of communism so you don't get this sort of large scale public production any more.
[1] http://neweconomicperspectives.org/2011/07/mmp-blog-8-taxes-...