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I think the line was from "Hello Dolly!" that money is like fertilizer.
You want people to buy things? Get them jobs, jobs that pay. The feds need to spend money on the infrastructure where people get good-paying jobs. Raise the minimum wage, build mass transit systems, invest in a national healthcare system where the d-bags at the top aren't pocketing billions. And using the latest technology, develop an energy industry where crews are upgrading homes with top-notch insulating technologies and covering roofs with solar panels.
When people have jobs that both pay and enrich society then the society as a whole will grow.
Also, figure out a way where we build some of this crap here.