It's simple: Parity against sterling at 100p means Irish firms shut down

Many businesses here which survived the initial slump in sterling may not survive another.

Putting it plainly, sterling falling to parity at 100 pence to the euro would mean many Irish businesses would be forced to shut down.

A further sharp fall from 91.25 pence in the run-up to the Halloween deadline on top of the slide from 72 pence since the summer 2016 referendum, would be disastrous.