Even if we want to argue that the average family only gets $50/y due to the Fed tax cut, lets break that down into something reasonable and logical for a family to buy. Kraft Mac-n-cheese and Ball Park hot dogs - iconic American food, cheap, easy, and tasty.
Now we presume that the grocery stores have optimal hot dogs and mac-n-cheese on hand, but when there's a run on folks buying more than usual, they order more than usual.
Kraft and Ball-Park we presume makes an optimal amount of this stuff to send to the stores, but when the stores are ordering more than usual, they have to make more than usual.
The pig and dairy farmers we presume produce an optimal amount of raw material to send to Kraft and Ball-Park, but when they're ordering more than usual, the pig and dairy farmers have to up their production as well.
New jobs shoveling shit and feeding livestock are created - and new families have a few more bucks to spend on Kraft Mac-n-cheese with Ball-Park hot dogs. Or whatever else these folks decide to buy, from food to cars to cell phones, computers, or even spending in the services to eat out or whatever. More coffee from Star Bucks, more hamburgers from McDonalds and again demand at the bottom of the chain goes up.
That's just one side of the economy, the supply demand side in simplistic form, driven by small tax cuts for the poor. If we look at the middle class, these folks are already eating decent so instead they maybe eat out an extra time a week, or maybe they go on vacation and pay for an Alaska tour or go to Disney Land/World, maybe they go to the movies, maybe they buy new linens, maybe they buy a new car and sell their old one to some poorer folks who then can get a better job further from home.
Then there's the rich folks ya'll like to lie about and diss all the time. We have many choices on how to spend our tax cuts, we can invest in businesses, we can invest it in the market, we can spend it. It's actually unlikely that we'll throw it in the bank/not spend it honestly. I mean I'm sure there is some rich prepper type out there who is worried about some shit so they sit on it, but by and large we rich folks don't /have/ to save money like the rest of you, we've already got our retirements planned and paid for, we've already got a healthy "emergency" fund set aside, we've already got our financial profile cooking, so instead we spend it... fast and loose. Like literally half my 2 car garage is filled with crap to go to Salvation Army right now, not broken or cheap shit either, just stuff I don't want anymore - an entire kitchen worth of dishes, tableware, and cookware simply because I changed my kitchen from blue to green, then after a few months I decided I wanted more contrast with my green counter tops so now I've gone to red. Us rich folks do this stupid crap all the time. Its like I have a full set of Americraft (really nice stainless oil filled cookware that's like $200-$500 a pot/pan) and yet in the past two years I've bought five different boxes pot/pan sets, only to give four of them away. (I'm using Rachael Ray's now; really like em.) The funny part is that even though I've replaced all this crap in the past year or two; I've got... at least 2000 items ear marked for further research and/or purchase on Amazon. I'm legit in a tizzy atm because I cannot find a ceramic coated half sheet. No one has made them yet, so I'm talking to CasaWare asking them to custom make me a half sheet and 2/3 sheet to match my other CasaWare baking pans. The dumb part? I know that CasaWare scratches so easy it's not even funny, I destroyed three pans just making thanksgiving dinner this year, but the colors are perfect (red and cream) and they work so great that I don't even care that I have to replace them every month, it doesn't matter to me because I can afford to "waste" $20-30 a pop for a baking pan. And that's just my kitchen... I also changed out the whole kit-n-kabootle in my bathrooms (shower doors, shower curtains, rugs, towels, towel bars, even the poofs - wanted a new color in every bathroom; new toilets too this time around, the guest toilet was ******* almond, gross... they're all white now. I also repainted the entire house - new colors, which meant new furniture, new carpet, new wood flooring, new rugs, new curtains, new light switches and outlet covers, new light fixtures, new keypad door locks (went from brass to stainless.) On and on, this is what we wealthy folks do, and when we do this silly crap there are more people getting jobs or maybe just getting a "bigger" pay check - interior designers, painters, carpet manufacturers and installers, seamstresses (to adjust my shower curtains from 85" long to 83" long,) Vivint installers, GCI cable installers, etc. etc. And those folks then have more to spend too, maybe those companies hire new employees, maybe they open up a showroom, maybe another location, or maybe they just eat out two more times a month and ramp up restaurants (Speaking of, mmmm they opened up a Panda Express out here last week - pepper chicken is my new favoritest food in the world heh) Or maybe they lower their prices and more people can afford that stuff...