Most mathematicians will be in jail.

Info Tech would crumble day 1

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.

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

Caffeine as an additive to drinks is weird.

Instant revolution.

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

The pyramids were built without coffee.

Make of that what you will.

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.

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.

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

If people couldn't find alternatives and caffeine wasn't illegally available...

Many people who need coffee to function in the morning would lose their shit. Overworked people and workers with really long shifts will not be able to keep up. People would probably fall asleep at work.

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

Especially on a Monday.