The Northern Ireland Fire Service has said attacks could have an effect on the service they can provide because injured firefighters can not be immediately replaced.

BBC: Concern about attacks on fire crews

But not all live animal research can be replaced.

ECONOMIST: Animal rights extremists

Retailers also need to be ruthless in chucking out products that do not gain from being sold in a physical store: not just things like CDs and DVDs, which can be replaced by digital goods, but bulky stuff like nappies (Amazon has become a big seller of Pampers).

ECONOMIST: Retailers and the internet