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..
Stepping stones must represent one of the earliest forms of paving used by mankind. The evolution of this type of elementary surfacing is fairly obvious: Early human is en route back to the cave with tonight's steak dinner thrown over shoulder and is confronted by a muddy surface.