> It looks cyclical to me. The materialism of the postwar era led into the civil rights movement of the late 60s and 70s, which turned into the materialistic 80s, which was rejected by the countercultural late 90s and 2000s, after which there was a slight deviation in which transgression rather than anti-materialism was rejected, and now we're back to materialism.

The post has loads of graphs going back to the 50's, with trend lines continually going down, not cycling up and down during those time frames.