Critics of laws against predatory pricing may support their case empirically by arguing that there has been no instance where such a practice has actually led to a monopoly.
The predator hopes to generate revenues and profits in the future that will more than offset the losses it incurred during the predatory pricing period.
Wherever a fare is deliberately pitched lower than the norm, this is termed predatory pricing and can lead to anti-trust action where regulators have some authority.
In most countries, predatory pricing is illegal, although it can be difficult to differentiate illegal predatory pricing from legal penetration pricing.