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II) L'approche Keynésienne, l'E comme résidu , déterminé par le revenu courant A) La loi psycho fondamentale (LPF)révo k après la crise de 1929 "échec de la théo n-c", k explique la crise et raisonne en macro, rejet d'une modélisation trop !, vers une science de l'esprit.Il réflechit à court terme(à long t nous sommes tous morts) + il y a d'E - il y a de conso, l'épargne n'est pas très bon pour l'éco car baisse de la prod et donc +chômage, une nécessité de conso.La LPF= +on gagne d'$ +on peut épargner et le r sup n'est pas conso entier, conso aug -vite que le revenu la LPF s'exprime par la propension margi à consommer (i.e la part du r à consommer) il y a donc des motifs individuels d'épargne (prévoyances, calcul, orgueil, avarice) et des motifs collectifs (dépend du syst de production(institution éco), religion normes culturelles) des invariants qui expliquent la stabilité de l'épargne .

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