If all humans suddenly lost their ability to lie, which industry WOULDN'T collapse??

Healthcare? I'd hope it would improve medical transparency.

Military would probably be fine, maybe even better off. When I was in the Air Force most of the important stuff was already brutally direct - mission briefs, safety protocols, chain of command decisions. You cant really sugarcoat "the enemy is here" or "this equipment is broken and dangerous" Sure you'd lose some diplomatic flexibility but the core function of defense and following orders would keep running. Plus imagine how much faster we could cut through bureaucratic BS if everyone just said exactly what they meant

Law/Court. Everyone can only tell the truth, and court efficiency is instantly maximized.

Plumbing Electricians Most trades

religion

govt

Il tabacco, c è già scritto che si muore..

actors

influnencers

The first problem is sales would collapse, and this could doom all other business functions. 

Nature documentaries

Yay! Word-for-word repost!

Insurance, believe it or not. We have such tight ethical rules around how we talk about and market our services. We have to say exactly how it helps, give disclaimers about the limits and what it doesn’t do, we can’t talk shit about competitors, we have rules around what products are comparable and how we replace them, we have to advise the customer on how they will be impacted if they drop coverage, etc. The laws make it impossible to lie without consequences (revoked license, fines, and jail time).

Marketing.