I hope, by this time, I have sufficiently shewn the difference in effect between the _simple_ and the _double_ competition; between the _vibrations_ of this balance of work and demand, and the _overturning_ of it. When it vibrates in moderation, and by short alternate risings and sinkings, then industry and trade go on prosperously, and are in harmony with each other; because both parties gain. The industrious man is recompenced in proportion to his ingenuity; the intrinsic value of goods does not vary, nor deceive the merchant; profits on both sides fluctuate according to demand, but never get time to consolidate with, and swell the real value, and never altogether disappear, and starve the workman. This happy state cannot be supported but by the care of the statesman; and when he is found negligent in the discharge of this part of his duty, the consequence is, that either the spirit of industry, which, it is supposed, has cost him much pains to cultivate, is extinguished, or the produce of it rises to so high a value, as to be out of the reach of a multitude of purchasers. The progress towards the one or the other of these extremes is easily perceived, by attending to the successive overturnings of the balance. When these are often repeated on the same side, and the balance set right, by a succession of forced restitutions only, the same scale preponderating a-new, then is the last period soon accomplished. When, on the contrary, the overturnings are alternate, sometimes the scale of demand overturning the balance, sometimes the scale of work, the last period is more distant. Trade and industry subsist longer, but they remain in a state of perpetual convulsion. On the other hand, when the balance gently vibrates, then work and demand, that is, trade and industry, like agriculture and population, prove mutually assisting to each other, in promoting their reciprocal augmentation. In order therefore to preserve a trading state from decline, the greatest care must be taken, to support a perfect balance between the hands employed in work and the demand for their labour. That is to say, according to former definitions, to prevent demand from ever standing long at an immoderate height, by providing at all times a supply, sufficient to answer the greatest that ever can be made: or, in other words, still, in order to accustom my readers to certain expressions, to encourage the _great_, and to discourage the _high_ demand. In this case, competition will never be found too strong on either side of the contract, and profits will be moderate, but sure, on both. If, on the contrary, there be found too many hands for the demand, work will fall too low for workmen to be able to live; or, if there be too few, work will rise, and manufactures will not be exported.