The entire premise of this question seems insane. The only industry in which caffeine is vital is probably the coffee industry.

Yeah, there would be a black market and what not but that doesn't mean the world would stop turning off supply ran out.

Most mathematicians will be in jail.

Same thing that happens with most drugs. It'll still get in, prices will skyrocket, and it'll be laced with fentanyl so instead of enjoying a nice cup of coffee, you'll die because the government tried to tell you what you can do to your own body again.

Perhaps some people would stop punishing their own bodies for the benefit of their employer.

Caffeine as an additive to drinks is weird.

I think productivity would increase after about a month of global caffeine withdrawal. Plus heart attacks would probably decrease

Have a headache for a few days. And reorganize everything to not start the workday before noon.

Anyone who comes between me and my tea leaves is a dead man.

Especially on a Monday.

It would be yet another failed policy pushed by the kind of idiots who like to ban things. Comics/Guns/Porn/Drugs etc.

I'd have a rough few weeks coming off my 8 espressos a day habit but I'd get over it eventually

Probably a lot more work related murders.

I would take a 30 minute nap every day after lunch.

Everyone would be miserable at first, so you wouldn’t want to be out in public for the first week or so, then after the withdrawal subsided it would be more or less back to normal. I went off caffeine for a while, once you get over the hump you realize you don’t actually need it as much as you thought.

Just a reminder that a substance being legal doesn't mean you should consume it.

Cartels would become huuuuuge (more hugerest than now) also fast car and fast boats sales would skyrocket.

That day I will definitely not being in the office. I mean... It's gonna be a wreckfest.

Personally I would pass away and die.