Mae papur masnach Brexit, a’r dadansoddiad o’r effaith economaidd gan Ysgol Fusnes Caerdydd, yn dadlau mai'r ffordd orau o amddiffyn economi Cymru yw drwy gadw mynediad llawn at Farchnad Sengl Ewrop a’r Undeb Tollau.
The Brexit trade paper, supported by an economic impact analysis from Cardiff Business School, argues the Welsh economy is best protected by retaining full access to the European Single Market and membership of a customs union.