_The Efficiency of Static Forces in Dynamic Societies._--The static state which has thus far been kept in view is a hypothetical one, for there is no actual society which is not changing its form and the character of its activities. Five organic changes, which we shall soon study, are going on in every economic society; and yet the striking fact is that, in spite of this, a civilized society usually has, at each particular date, a shape that conforms in some degree to the one which, under the conditions existing at that date, the static forces acting alone would give to it. It is even true that, as long as competition is free, the most active societies conform most closely to their static models. If we could check the five radical changes that are going on in a society that is very full of energy,--if, as it were, we could stop such an organism midway in its career of rapid growth and let it lapse into a stationary condition,--the shape that it would take would be not radically unlike the one which it had when we interposed the check on its progress. Taking on the theoretically static form would not strikingly alter its actual shape. The actual form of a highly dynamic society hovers relatively near to its static model though it never conforms to it. In the case of sluggish societies this would not be true; for if in one of them we stopped the forces of growth and waited long enough to let the static influences produce their full effects, the shape to which they would bring the organism would be very different from the one which it actually had when its slow progress was brought to a stop. Most efficient in the most changeful societies are forces which, if they were acting by themselves alone, would produce a changeless state. The reasons for this will later appear.