The term 'economic planning' and perhaps still more bluntly 'planned economy' contains a tautology... The word 'economy' by itself implies, of course… - Gunnar Myrdal

Looking backward on a period which is finished, we are looking at actually realized returns, costs, etc., as those items are registered in the bookkeeping of business. In such an ex post calculation there is, as we will show later, an exact balance between the invested waiting and the value of gross investment [Phil: he appears to mean savings and investment]. Looking forward there is no such balance except under certain conditions which remain to be ascertained. In the ex ante calculus it is a question not of realized results but of anticipations, calculations, and plans driving the dynamic process forward. Had this distinction been kept in mind, much confusion about “saving and investment” would have been avoided. There is in fact no contradiction at all between the statement of an exact bookkeeping balance ex post and the obvious inference that in a situation in which saving is increasing without a corresponding increase in investment, or perhaps with an adverse movement in investment, there must be a tendency ex ante to disparity.

There is in fact no contradiction at all between the statement of an exact bookkeeping balance ex post and the obvious inference that in a situation when saving is increasing without a corresponding increase of investment, or perhaps with an adverse movement in investment, there must be a tendency ex ante to a disparity.

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.