That analysis is guided by an economist's faith in the maxim that people are generally pretty good at looking out for their own interests.
( ( That analysis ) ( ( is ( ( guided ( by ( ( ( an ( economist 's ) ) faith ) ( in ( the maxim ) ) ) ) ) ( that ( people ( ( are generally ) ( pretty ( good ( at ( ( looking out ) ( for ( their ( own interests ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT That) (NN analysis)) (VP (VBZ is) (VP (VBN guided) (PP (IN by) (NP (NP (NP (DT an) (NN economist) (POS 's)) (NN faith)) (PP (IN in) (NP (DT the) (NN maxim))))) (SBAR (IN that) (S (NP (NNS people)) (VP (VBP are) (ADVP (RB generally)) (ADJP (RB pretty) (JJ good) (PP (IN at) (S (VP (VBG looking) (PRT (RP out)) (PP (IN for) (NP (PRP$ their) (JJ own) (NNS interests)))))))))))) (. .)))
People always just look out for themselves 
( People ( ( always just ) ( ( look out ) ( for themselves ) ) ) )
(ROOT (S (NP (NNS People)) (VP (ADVP (RB always) (RB just)) (VBP look) (PRT (RP out)) (PP (IN for) (NP (PRP themselves))))))