“…See, for example, [2-4, 6-11, 13, 14, 16, 19, 20, 22, 25, 27, 32-34, 36, 37, 46-49, 51, 52] and the references mentioned therein. These problems arise in engineering [1,23,44,56,57], in models of economic growth [12, 13, 17, 22, 26, 31, 35, 39-41, 44, 45, 53, 55], in the game theory [18,21,43,44,50,53,54], in infinite discrete models of solid-state physics related to dislocations in one-dimensional crystals [5,42], and in the theory of thermodynamical equilibrium for materials [15,24,[28][29][30]. In this chapter we explain the turnpike phenomenon for a simple class of variational problems, discuss certain turnpike results obtained in our previous research, and describe the structure of the book.…”