But the struggle between these few big survivors becomes more fierce than ever.  Fitted out with enormous capital, provided with the latest, most complex, and most expensive machinery, producing with a reckless disregard for one another or the wants of the consuming public, advertising on a prodigious scale in order to force new markets, or steal the markets of one another, they are constantly driven to lower their prices in order to effect sales; profits are driven to a minimum; all the business energy at their command is absorbed by the strain of the fight; any unforeseen fluctuations in the market brings on a crisis, ruins the weaker combatants, and causes heavy losses all round.  In trades where the concentrative process has proceeded furthest this warfare is naturally fiercest.  But as the number of competing units grows smaller, arbitration or union becomes more feasible.  Close and successful united action among a large number of scattered competitors of different scales of importance, such as exist during the earlier stage of capitalism, would be impossible.  But where the number is small, combination presents itself as possible, and in so much as the competition is fiercer, the direct motive to such combination is stronger.  Hence we find that attempts are made to relieve the strain among the largest businesses.  The fiercest combatants weary of incessant war and patch up treaties.  The weapon of capitalist warfare is the power of under-selling—­“cutting prices.”  The most powerful firms consent to sheathe this weapon, i.e. agree not to undersell one another, but to adopt a common scale of prices.  This action, in direct restraint of competition, corresponds to the action of a trades union, and is attained by many trades whose capital is not large or business highly developed.  Neither does it imply close union of friendly relations between the combining parties.  It is a policy dictated by the barest instinct of self-preservation.  We see it regularly applied in certain local trades, especially in the production and distribution of perishable commodities.  Our bakers, butchers, dairy-men, are everywhere in a constant state of suspended hostility, each endeavouring indeed to get the largest trade for himself, but abiding generally by a common scale of prices.  Wherever the local merchants are not easily able to be interfered with by outsiders, as in the coal-trade, they form a more or less closely compacted ring for the maintenance of common terms, raising and lowering prices by agreement.  The possibility of successfully maintaining these compacts depends on the ability to resist outside pressure, the element of monopoly in the trade.  When this power is strong, a local ring of competing tradesmen may succeed in maintaining enormous prices.  To take a humble example—­In many a remote Swiss village, rapidly grown into a fashionable resort, the local washerwomen are able to charge prices twice as high as those paid in London, probably four times as high as the normal price of the neighbourhood.