In today's debate, hard-liner Ali Akbar Velayati, a top adviser to the supreme leader, said Iran cannot use its full capacities without improving ties with the world and neighboring countries.
Iran's economy has been ailing in part because of international sanctions over Iran's disputed nuclear programme.
Few candidates directly referred to sanctions, though one, Mohsen Rezaei, a former Revolutionary Guard commander, said, "We should find a logical solution for the sanctions" to deal with inflation.