"The broader impacts - the macroeconomic impacts if you like - would see the economy go into recession and we would also see the New Zealand dollar fall so the impacts on urban areas would be keenly felt as well.
"The standard approach to foot-and-mouth is to cull stock in many cases so that obviously would have a drastic impact on our ability to export those stocks, that would be removed," Penny said.
He said regional New Zealand, which is dominated by the rural sector, would be particularly hard hit.
"When we think about the provinces, they're heavily exposed to agriculture and their economies are less diverse than the likes of Auckland, Wellington or Christchurch ... those economies would rebound faster than the provincial centres.
"But that said, we do have some experience in dealing with these sorts of things. We had recent experience with Mycoplasma bovis.
"We have got some of the best biosecurity systems in the world and that could mean that there would be the possibility that New Zealand and the rural regions could bounce back from this pretty quickly," Penny said.
Biosecurity New Zealand said while the risk to New Zealand was low, it had boosted efforts to protect farmers from foot-and-mouth including stepped-up inspections at the border and providing more information for travellers.
"Our focus is doing everything we can on the border," Stuart Anderson, deputy director-general Biosecurity New Zealand said.
Listen to Jamie Mackay's full interview with Stuart Anderson on The Country below:
"Our approach is to assess all and any passengers coming through from Indonesia, who have been on holiday in Bali," Anderson told The Country's Jamie Mackay.
"They will be getting further questions from our border by security staff and we will be visually inspecting the likes of footwear or other equipment they may have with them."
If any items looked contaminated, border security officers would remove them and take them to the airport's laboratory space to be disinfected safely, Anderson said.
- RNZ with additional reporting from The Country