27. ←. The exemption is subject to the conclusion of a company agreement with a trade union. Union density is particularly low among younger workers, and since 2000 almost half of the countries shown in Figure 2.5 have declined more sharply than older workers. According to some, this pattern reflects the different preferences of younger generations (Blanchflower, 2007). Younger workers have been described as more individualistic than older workers (Berry and Mcdaniel, 2018), less tied to a given firm, and less vulnerable to collective action. On the other hand, some say they prefer environmental and consumer organizations, thus crowding them out in a union manner (Inglehart, 1997). Another argument is that young workers find unions unattractive and old-fashioned.  Fougère, D., E.
Gautier and S. Roux (2018), « Wage floor rigidity in industry-level agreements: Evidence from France », Labour Economics, Bd. 55, S. 72-97, dx.doi.org/10.1016/j.labeco.2018.09.001. . .