Equilibrium Problems and Applications develops a unified variational approach to deal with single-valued, set-valued and quasi-variational equilibrium problems. The authors develop original results in relationship with classical contributions to the field of equilibrium problems. The content is mainly developed in the general setting of topological vector spaces and lies at the interplay between pure and applied nonlinear analysis, mathematical economics and mathematical physics. This abstract approach is based on tools from various fields, including set-valued analysis, variational...