If humans suddenly couldn’t lie at all, the advertising industry would likely collapse first.
A large part of advertising relies on exaggeration, emotional persuasion, and presenting products in the most flattering way rather than giving completely plain facts. Without the ability to stretch the truth, many ads would lose their impact and much of the industry’s current approach wouldn’t work.

Religion

Lawyers

Liberal politicians and rinos

I don't think industries will collapse. They would get better and more effective. Bad companies will definitely fold.
• Products would be better quality
• food would be healthier
• politicians and lawyers could be held to a higher standard
• advertising and PR would be telling the truth
• transparency in business would create a fair margin for companies, fair wages for workers and fair prices for consumers

I'm trying to find an industry that wouldn't excel

All of them really.

Political systems, court systems, live tv then modern marriages.

1) politics
2) tv preachers
3) car salesmen
and dating would ...oh gawd...the humanity

Operah whinfrey she based her entire career around weight loss and many other topics she made money out of it

Politics

Insurance

Mattress manufacturing

Government would be the first to go under

Many good answers already

How about these... Parenting* and casinos...

Not an industry, but it takes a lot of story telling

The insurance industry for sure.

Pharmaceuticals

If they can't lie , Any Job where manipulation is common would collapse.

all the bad corrupt ones nasa

Sales, marketing

Social Media..

President of the United States of America

My answer - social media will go down first

The gender reassignment industry.

News corp

Every government on the planet

Which ones wouldn’t? 🤷‍♂

Media, war and Zionism

All the ones I'm seeing mentioned here (politics, manufacturing, legal, etc) wouldn't go anywhere, they'd transform or even improve.

Of this that'd actually disappear: theatre and cinema. You can't act without "lying" about who you are and where you are.

Humanity.

It would be like everyone able to read each other's minds without the ability to block it.

No Industry, business, organization or group of people could function without the individuals going insane first. For even purposeful omission can be considered a lie.

Much simpler to try and name which one wouldn't.

Every legislature.

All politicians spend their entire career pandering. Campaign promises are simply the future lies that have yet to gestate.

Fake news; all CBS, ABC, MSN, CNN, NBC along with Face book, Tinder, and other social media.

None whatsoever.

The US has had two terms of a serial pathological liar who literally lies multiple times a day, and that wasn't enough to prevent him getting elected or re-elected.

People don't actually give a shit about lying, they'll just lie about the lying.