More FUD
A Brexit would lead to investment and currency uncertainty, disrupt trade, undermine the all-island economy and affect energy and climate change strategies, Ibec said.
There's no reason that any of that would happen. UK and Ireland have had a free-travel zone since long before the EU existed, they used to share a currency before Ireland went off alone (which was pre-Euro) and the current Euro/Sterling situation won't change if the UK leaves. As for climate change and energy policy, they're signe dup to the same agreements and also share energy grids via interconnects which aren't going to evaporate on Brexit, unless they're planning to issue electrons with passports?
It's this sort of FUD that makes people so skeptical of the pro and con arguments, they're all just theories pulled out of thin air to support whatever line the person proposing them wants to push.