Was not the song written quickly?
Just because Ewan was a member of the Communist party at the time, it does not necessarily follow that the song or the phrase was an attack on Capitalism.
Songs can be interpreted in different ways by different people
Dylan is a prime example of a songwriter whose songs are on occasions deliberately Enigmatic, example.. Farewell Angelina or Quinn the Eskimo.
And his fans are often looking for a deeper meaning.