But the trouble does not end here. The equality: pain-cost = pleasure-gain, is not a competent formula. It should be: pain-cost incurred = pleasure-gain anticipated. And between these two formulas lies the old adage, "there's many a slip 'twixt the cup and the lip." In an appreciable proportion of ventures, endeavors, and enterprises, men's expectations of pleasure-gain are in some degree disappointed,--through miscalculation, through disserviceable secondary effects of their productive efforts, by "the act of God," by "fire, flood, and pestilence." In the nature of things these discrepancies fall out on the side of loss more frequently than on that of gain. After all allowance has been made for what may be called serviceable errors, there remains a margin of disserviceable error, so that pain-cost > eventual pleasure-gain = anticipated pleasure-gain--_n._ Hence, in general, pain-cost > pleasure-gain. Hence it appears that, in the nature of things, men's pains of production are underpaid by that much; although it may, of course, be held that the nature of things at this point is not "natural" or "normal." To this it may be objected that the risk is discounted. Insurance is a practical discounting of risk; but insurance is resorted to only to cover risk that is appreciated by the person exposed to it, and it is such risks as are not appreciated by those who incur them that are chiefly in question here. And it may be added that insurance has hitherto not availed to equalise and distribute the chances of success and failure. Business gains--entrepreneur's gains, the rewards of initiative and enterprise--come out of this uncovered margin of adventure, and the losses of initiative and enterprise are to be set down to the same account. In some measure this element of initiative and enterprise enters into all economic endeavor. And it is not unusual for economists to remark that the volume of unsuccessful or only partly successful enterprise is very large. There are some lines of enterprise that are, as one might say, extra hazardous, in which the average falls out habitually on the wrong side of the account. Typical of this class is the production of the precious metals, particularly as conducted under that regime of free competition for which Mr. Clark speaks. It has been the opinion, quite advisedly, of such economists of the classic age of competition as J. S. Mill and Cairnes, _e.g._, that the world's supply of the precious metals has been got at an average or total cost exceeding their value by several fold. The producers, under free competition at least, are over-sanguine of results.