HC Deb 26 July 1968 vol 769 cc261-2W
Mr. Ridley

asked the Minister of Power what is, at present, the long-term marginal cost of producing coal at the pit head, in terms of pence per therm.

Mr. Freeson

The concept of the long-term marginal cost of production in an industry which is changing rapidly is complex. Much depends on assumptions about productivity, production levels and the rate of contraction.

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