Check out economic arguments for a Brexit at the website of Economists for a Brexit:
“The Economists for Brexit is a group of eight independent, leading economists who are convinced of the strong economic case for leaving the EU. To date, debate on the economic merits of whether the UK should remain in the EU has become overwhelmed by the Government’s Project Fear campaign. Each of the eight economists have become exasperated by the scaremongering and often economic illiteracy of this campaign.
At the same time, the group believes that whilst there are a substantial number of economic arguments to support Brexit, they are yet to be made in public. The purpose of this group is to explain the vey clear economic arguments in favour of Brexit, offering voters – who are crying out for clarity on the economics of Brexit facts based on proven economic models, as opposed to speculation.”