Repairing a walkway or building a new one
If a few pavers have dropped in one spot, we can usually lift them, fix the base under that spot and reset them. If a concrete walk is cracked and sunk along its length, or a gravel path ruts everywhere, the trouble is usually the ground or base under it, and patching the top won't last. In that case I'd tell you to rebuild, because the cause is underneath.
What shapes the cost of a walkway
Size comes first, then the surface, since pavers, stabilized decomposed granite and concrete each take different materials and labor. After that it's the ground. Tearing out an old walk, hauling soil and building a deeper base all add to the job. A straight run costs less than a curved one because it needs fewer cuts, and steps, borders or tight access for equipment raise it. Work near the road can also bring a permit.