The Grand Paris Express aims at modernising the existent transport network in the Île-de-France and its investments are estimated at €28 billion for the period 2010-2037.

Based on the assumption of a combined 1% increase in labour productivity due to better matching between skill supply and demand and a 1% increase in accessibility achieved with the completion of the project, the RHOMOLO simulations suggest an overall medium-term positive GDP impact for the EU as a whole (0.18%), for France (0.79%) and for Île-de-France (2.61%).

The full Technical Report can be found here.