ONE of the marked features of economic thought in recent years, and in particular in the last decade, has been a decline in the older dogmatism, a quickening of scepticism and a reawakening of controversy. What a few years back was treated as settled doctrine, requiring only refinement of its implications and application to special problems, is to-day questioned in its basic assumptions. Systems of thought whose final shape was regarded as perfected, save for a few trifling elaborations, are thrown back into the melting-pot.