That’s too hard to do. What is “a robot” and “a job?” Replacing workers is easy enough to calculate that with, but what if I start a brand new factory that only ever used robots? The solution is wealth tax and UBI.
Get rid of regular income tax, then do a progressive wealth tax, which is enough to pay for a progressive UBI. This way, it’s no problem if you lay off all your workers to replace them with robots. In fact that’s great! Because now these people have a UBI, which frees them up to go find (or make) other work. Meanwhile the factory owner’s taxes should be going up, since his wealth is going up since he doesn’t have to pay all the workers, unless he’s still spending that money to further invest in things, which is also great.
The biggest problem really is people just hoarding wealth. If they are spending or investing it, then that’s not a problem.
Very few people hoard wealth. You imagine wealthy people like Scrooge McDuck with a room full of gold coins. It's almost always invested in stocks which helps companies grow or in bonds which helps finance public works.
Pretty sure a diverse portfolio will feature gold. It might not be in gold coins in the owners basement though.
Investing in stocks where most companies are doing their best to suppress worker compensation or out-right replace them with robots doesn't feel like it's doing much to help the average person either.
Public investment is on a downward trend since 2008 when governments had to save the bankers. What government spending there still is often has to filter through private service companies that are given government contracts. This usually results in good dividends and bad service.
You need to start with no/little increase in taxes from corporations and see how that works. Previously unthought of loopholes will keep the status quo of low corporate tax payments.
> The biggest problem really is people just hoarding wealth
That is a pretty substantial problem and doesn’t seem close to the biggest one.
Get rid of regular income tax, then do a progressive wealth tax, which is enough to pay for a progressive UBI. This way, it’s no problem if you lay off all your workers to replace them with robots. In fact that’s great! Because now these people have a UBI, which frees them up to go find (or make) other work. Meanwhile the factory owner’s taxes should be going up, since his wealth is going up since he doesn’t have to pay all the workers, unless he’s still spending that money to further invest in things, which is also great.
The biggest problem really is people just hoarding wealth. If they are spending or investing it, then that’s not a problem.