Some of these quantities refer directly to a point of time. That is true of "capital value" as also of such quantities as demand and supply prices. O… - Gunnar Myrdal

Of all the calamities that have struck the rural Negro people in the South in recent decades—soil erosion, the infiltration of white tenants into plantation areas, the ravages of the boll weevil, the southwestern shift in cotton cultivation—none has had such grave consequences, or threatens to have such lasting effect, as the combination of world agricultural trends and federal agricultural policies initiated during the thirties.

For these anticipations determine the behaviour of the economic subjects and consequently those changes in the whole price system which during a period actually occur as a result of the actions of individuals.

It is good proof of Keynes’ intuitive genius that he reaches practical results that in many respects are very much superior to his deficient statements of certain theoretical problems.