  We studied meson-meson interactions using the 't Hooft model, which
represents QCD in 1+1 dimensions and assumes a large number of colors ($N_c$).
The dominant interactions in this large $N_c$ limit are generated by quark
exchange. Our results show that QCD in 1+1 dimensions allows the realization of
a constituent-type quark model for the mesons, and generates a scalar
``$\sigma$''-like meson-meson resonance, whose effective coupling and mass are
determined by the underlying QCD dynamics. These results suggest an
interpretation of the lightest scalar mesons as $q\bar{q} q \bar{q}$ systems.
