15 authorises the Central Government to make or cause to be made a full and complete investigation into the circumstances of the case if the Central Government is of the opinion that : (a) in respect of any scheduled industry or industrial undertaking or undertakings (i) there has been, or is likely to be, a substantial fall in the volume of production. for which, having regard to the economic conditions prevailing, there is no justification; or (ii) there has been, or is likely to be, a marked deterioration in the quality of any article. . . which could have been or can be avoided; or (iii) there has been or is likely to be a rise in the price of any article. . for which there is no justification; or (iv) it is necessary to take any such action for the purpose of conserving any resources of national importance; or (b) any industrial undertaking is being managed in a manner highly detrimental to the scheduled industry concerned or to public interest.