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We study scalar quark-anti-quark and two-quark-two-anti-quark correlationfunctions in the instanton liquid model. We show that the instanton liquidsupports a light scalar-isoscalar (sigma) meson, and that this state isstrongly coupled to both $(\bar{q}q)$ and $(\bar{q}q)^2$. The scalar-isovector$a_0$ meson, on the other hand, is heavy. We also show that these propertiesare specific to QCD with three colors. In the large $N_c$ limit thescalar-isoscalar meson is not light, and it is mainly coupled to $(\bar{q}q)$.Comment: 24 page

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

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Instantons and scalar multiquark states: From small to largeNc