Resources for the Future Pizer and Kopp. 3. cost to the economy.5 This is the notion of cost most often described by economists (e.g., Harberger 1971; Diamond and Mirrlees 1971). Defining and estimating Ci ()az, is far from trivial.
For stepping stones that are going to see a lot of use, you should consider using reinforced concrete so that your stepping stones are more durable. This type of concrete also sells at most hardware stores, often under the names gravel mix reinforced or fiber reinforced premixed concrete..
A stepping-stone path is the most informal of paths and looks best when it has as many curves as possible. The outline of the path doesn't have to be precise. If the edges of some stones fall slightly outside the edge of the path, it merely adds to the appeal. Stepping-stones are set individually in sand recesses, each excavated to conform to the shape of the individual stone. The path doesn't require a gravel base, just a 2-inch sand base in the recess dug in the soil.