From the analysis in Part I,1 certain practical conclusions of a general character may immediately be drawn. First and foremost, the analysis implies that rates should be fixed, so far as possible, in accordance with time of consumption-i.e. that some sort of timeof-day (and time-of-year) tariff should be introduced. Second, it implies that one should 'charge high rates at times when consumption would tend to rise above the level of capacity, so as to bring the corresponding portion of the load curve down to the horizontal'. And third, it implies that one should charge low rates at times when 'consumption at the price fixed cannot attain the level of capacity'with the important proviso here that the rates charged should never be lower than short-run marginal costs. As a result of this pricing policy, it is suggested, the load curve would become horizontal, with hollows here and there in places where a price equal to short-run marginal cost was still not low enough to extend demand to the level of capacity.2 The great question, however, is that of how far one should in fact go in making the load curve horizontal. By increasing prices and reducing capacity sufficiently, the load curve could if required be made completely horizontal, with no hollows in it at all; but this would usually mean lowering it far below the level which most people would consider desirable. It is in relation to this crucial question of the appropriate level of the horizontal portion of the load curve that Boiteux makes what is perhaps his most useful and distinctive contribution. The level of the horizontal part of the curve which should properly be aimed at, he argues in effect, is determined by the condition that the prices charged to the demand or demands on the horizontal part of the curve should be just sufficient to cover not only the appropriate energy costs but also the whole of the long-run marginal capacity cost. And this condition will automatically be fulfilled, as we have seen, if the capacity of the plant is adjusted to the 'optimum' level. In the 'optimum' situation, the pursuance of
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