To take into account those externalities means taking into account everything from the loss of seafront property and farm productivity to deaths caused by heatwaves (as well as those avoided in cold snaps).
And I absolutely loved the culture, the lifestyle that people leave there, the cafes and restaurants and everything else and the seafront obviously in Cadiz.
I read in the Daily Telegraph of all places this morning about a local authority removing a large number of flags from a seafront park after a man was punched to the ground in a racist attack.
Besides the nearby pebble beaches, the main tourist attraction is the Batana Eco-museum on the seafront, which tells the story of the Batana, a type of wooden boat used by local fishermen.
Then it was another sharp right turn back onto the boulevard, parallel with the seafront, and another long top-speed blast to the finish, 15.99 miles in all.
The western line ran services between St Helier and St Aubin with trains stopping at three intermediate stations along the seafront and later extending to La Corbiere.