“4. Having heard the learned counsel for the parties, we are satisfied that no case is made out for interference with the judgment of the High Court. Before the High Court, the principal plea of the respondent was that there was no contract in writing and, therefore, the applicability of the principle of promissory estoppel was not established. The High Court has rightly discarded this plea. To attract the applicability of the principle of estoppel it is not necessary that there must be a contract in writing entered into between the parties. We are not satisfied even prima facie that it was a case of an error committed by the State Government of which it was not aware. The State of Orissa should have, while holding out the representation, taken into consideration the fact who will have to do replantation and that the permission of the Government of India would be needed for the purpose. The State cannot take advantage of its own omission. The State Government having persuaded the respondent to establish an industry and respondent having acted on the solemn promise of the state Government, purchased the raw material at a fixed price and also sold its products by pricing the same taking into consideration the price of raw material fixed by the State Government and supplied, the State Government cannot be permitted to revise the terms for supply of raw material adversely to the interest of the respondent and effective from a back date and place the respondent in a situation which it will not be able to resolve. The respondent could not have revised their price from a back date and recovered it from
