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..
the concrete used for gravel boards is normally made with small aggregates. They are easy to cut and a 9 electric grinder will do the trick, but a stihl saw will make very light work of it.Dont forget they have a couple of bars of reinforcement running through so just let the blade do its work.he concrete used for gravel boards is normally made with small aggregates. They are easy to cut and a 9 electric grinder will do the trick, but a stihl saw will make very light work of it. Dont forget they have a couple of bars of reinforcement running through so just let the blade do its work.