A pro-Brexit economist suggests that there are benefits amounting to £135bn annually which would accrue from the UK unilaterally abandoning all tariffs and removing swathes of legislation.
http://www.bbc.co.uk/news/business-40972776
An Anti-Brexit group suggests that the analysis is flawed.
The pro-brexit economist also suggested deregulating the economy, which I suspect means getting rid of all those pesky workers rights and environmental regulations.