evidence: The Northern Ireland Protocol keeps Northern Ireland (NI) inside the European Union's (EU) single market for goods. [...] The economic flipside is that Northern Ireland businesses now have an advantage over GB exporters because they still have full access to both the EU single market and the rest of the UK. [...] It finds that in the medium term the protocol would leave Northern Ireland's economy 2.6% smaller compared to a scenario in which the UK had stayed in the EU.