Well the phrase exists, I'm currently undecided on the concept's practical application.
Tell me if you've heard something like this before:
The pursuit of (rational) self-interest in absence of (government) interference (controls, barriers, obstacles) [so long as the effective freedoms of others are not impinged].
The latter part is almost always dropped. Its practical application gave us modern Russia, Iraq, Reagan/Maggie, neoliberal economics, New Labour, marketisation, targets and KPIs, democracy building, and so on. It's also aimless and nihilistic in practice, as it fundamentally views the human being as incapable of any meaningful improvement (of a greedy and psychopathic nature).
Its cultural application brought us strivers and skivers, and the following perversion of the concept:
'I do what I please, get out of my way and **** anyone who disagrees.'
Since maintaining this form of liberty is actually pretty hard (people aren't rational, game-theoretical creatures), governments often end up as managerial tyrants, trying to force the populace to be negatively free.
Zero hour contracts dont exploit the worker.
And you know this how?
I'd argue that as a contract, 0-hours is merely a gimped temp contract which was imported from high staff churn industries as a means to control the workforce and depress unions. Flexibility is great for some demographics, not so great for others. The key problems being:
https://fullfact.org/economy/facts-about-zero-hour-contracts/
Zero hour contracts provided about 25 hours work a week, compared with the 37 hours average for all people in employment in October-December 2014.
Low to very variable income.
Larger firms were the most likely to have people on zero hour contracts. Half of companies with over 250 people had employees on zero hour contracts in August 2014, compared with 1 in 10 businesses employing under 20 people.
Actually being predominantly gamed and used by big businesses.
What about exclusivity clauses?
An exclusivity clause in a contract means that you can't work for another company. Which is a problem if you don't get enough work from your sole employer—who isn't obliged to offer you any.
In response to these concerns, the government is currently looking at banning exclusivity clauses in zero hour contracts.
The Industrial Relations body ACAS say that 'effective exclusivity' is also an issue. This is where no official exclusivity clause exists, but workers may feel unable to seek employment elsewhere or turn down work from their current employer for fear of losing the hours they already have.
Inability to gain extra hours whilst remaining locked in with a single abusive employer.
It does need reform to ensure the benefits of this arrangement for small companies are maximised whilst abuse is stamped out.