23 in fact represented consumption of irreplaceable wealth. We have already said that nothing comes from nothing. From what then, in terms of the consumption of our metal resources, did our wealth come? By better understanding the relationship between these aspects of production and consumption, we might also gain further insight into the potential ability of others to emulate the American experience. Before going further, it is necessary to take a closer look at some important terms, such as "production, "resources," and "abundance." Production is usually defined as the creation of utility, the making of goods or services for the satisfaction of human wants; but, "production" and "productive activities" are very ambiguous terms with which to deal. Production involves the creation of utility but it ultimately is concerned with the manip ulation of materials. As such, production deals not only with creation but with conversion. Utility is created. Materials are converted. Substances are rearranged to suit men's fancy through productive effort, but the materials from which final items are made must exist before any production can take place. Ideas and skills, with nothing to embody them, remain ideas and skills and nothing more.