The implementation of ITQs or IFQs works in tandem with the privatisation of common assets. This regulatory measure seeks to economically rationalise access to a common-pool resource. This type of management is based in the doctrine of natural resource economics. Notably the use of ITQs in environmental policy has been informed by the work of economists such as Jens Warming, H. Scott Gordon and Anthony Scott. It is theorised that the primary driver of over-fishing is the rule of capture externality. This is the idea that the fisherman does not have a property right to the resource until point of capture, encouraging competitive behaviour and overcapitalisation in the industry. It is theorised that without a long-term right to fish stocks, there is no incentive to conserve fish stocks for the future.