With regard to sub-clause (3) it has also been agreed that there are certain commodities which are so essential for the life of the community throughout India that they should not be subject to sales tax by the province in which they are to be found. Therefore it was felt that if there was any such article which was essential for the life of the community throughout India, then it is necessary that, before the province concerned levies any tax upon such a commodity, the law made by the province should have the assent of the President, so that it would be possible for the President and the Central Government to see that no hardship is created by the particular levy proposed by a particular province.