  In this paper, we investigate system theoretic properties of transient
average constrained economic model predictive control (MPC) without terminal
constraints. We show that the optimal open-loop solution passes by the optimal
steady-state for consecutive time instants. Using this turnpike property and
suitable controllability conditions, we provide closed-loop performance bounds.
Furthermore, stability is proved by combining the rotated value function with
an input-to-state (ISS) Lyapunov function of an extended state related to the
transient average constraints. The results are illustrated with a numerical
example.
