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..
Various materials can be used. Sand is the easiest to work with, though small stones or gravel are also acceptable options. You can also use concrete provided it doesn't get squeezed out by the pressure of the slab. Place a sheet of plastic under the slab over the wet concrete before lowering the slab. This will keep the new cement from sticking to the slabâ¦ just in case you have to relevel it sometime in the future. Some long slabs, such as those used for concrete walks, are made in a single pour.