Farmers steering tractors take part in a national demonstration on the Cours de Vincennes avenue near Place de la Nation in Paris, on September 3, 2015, to protest against the falling prices that they say are endangering their livelihoods. The protest comes after months of unrest as farmers in the dairy and meat industries become increasingly desperate in the face of plummeting food prices which they blame on foreign competition, as well as supermarkets and distributors. AFP PHOTO / THOMAS SAMSON        (Photo credit should read THOMAS SAMSON/AFP via Getty Images)