Task: Question Answering
Input (English): Passage: Stereolab's music is politically and philosophically charged. Dave Heaton of PopMatters said that the group "[uses] lyrics to convey ideas while using them for the pleasurable way the words sound." The lyrics of the 2006 compilation Fab Four Suture, contains themes of war, governments that suppress freedom, and "the powerlessness that everyday people feel in the face of it all", in contrast to "humans [working] together, [treating] each other like people, and [pushing] for governments that would do the same." Lætitia Sadier, who writes the group's lyrics, was influenced by both the Situationist philosophy Society of the Spectacle by Marxist theorist Guy Debord, and her anger towards the Iraq War. The Surrealist, as well as the Situationist cultural and political movements were also influences, as stated by Sadier and Gane in a 1999 Salon interview.Critics have seen Marxist allusions in the band's lyrics, and have gone so far as to call the band members themselves Marxist. Music journalist Simon Reynolds commented that Sadier's lyrics tend to lean towards Marxist social commentary rather than "affairs of the heart". The 1994 single "Ping Pong" has been put forward as evidence in regard to these alleged views. In the song, Sadier sings "about capitalism's cruel cycles of slump and recovery" with lyrics that constitute "a plainspoken explanation of one of the central tenets of Marxian economic analysis" (said critics Reynolds and Stewart Mason, respectively).Band members have resisted attempts to link the group and its music to Marxism. In a 1999 interview, Gane stated that "none of us are Marxists ... I've never even read Marx." Gane said that although Sadier's lyrics touch on political topics, they do not cross the line into "sloganeering". Sadier also said that she had read very little Marx. In contrast, Cornelius Castoriadis, a radical political philosopher but strong critic of Marxism, has been cited as a marking influence in Sadier's thinking. The name of her side project, Monade, and its debut album title, Socialisme ou Barbarie, are also references to the work of Castoriadis.Stereolab's album and song titles occasionally reference avant-garde political groups and artists. Gane said that the title of their 1999 album Cobra and Phases Group Play Voltage in the Milky Night contains the names of two Surrealist organisations, "CoBrA" and "Phases Group", The title of the song "Brakhage" from Dots and Loops (1997), is a nod to experimental filmmaker Stan Brakhage. Other examples are the 1992 compilation Switched On, named after Wendy Carlos' 1968 album Switched On Bach, and the 1993 song "Jenny Ondioline", an interlock of inventor Georges Jenny and his instrument the Ondioline. 
Question: What is the full name of the critic who describes the lyrics to Ping Pong as "a plainspoken explanation of one of the central tenets of Marxian economic analysis"?
Output (English): Stewart Mason.