Obviously, in order to be useful for economic policy-making, these forecasts, though they may be conditional, must factor in data that are not included in the present models and also allow for judgment based on experience and theory; as I have already said, they must not be “mechanical”.
The time has not yet come when we can consider the “economic problem” as a “matter for specialists – like dentistry”, as Keynes, in 1930, would have liked.