When any corporation liable to taxation under this chapter by agreement or otherwise conducts the business of such corporation in such manner as either directly or indirectly to benefit the members or stockholders of the corporation, or any of them, or any person or persons directly or indirectly interested in such business, by either buying or selling its products or the goods or commodities in which it deals at more or less than a fair price which might be obtained therefor, or when such a corporation sells its products, goods or commodities to another corporation or acquires and disposes of the products, goods or commodities of another corporation in such manner as to create a loss or improper taxable income, and such other corporation by stock ownership, agreement or otherwise controls or is controlled by the corporation liable to taxation under this chapter, the Department may require such facts as it deems necessary for the proper computation provided by this chapter and may for the purpose determine the amount which shall be deemed to be the Virginia taxable income of the business of such corporation for the taxable year. In determining such income, the Department shall have regard to the fair profits which, but for any agreement, arrangement or understanding, might be, or could have been, obtained from dealing in such products, goods or commodities. Any corporation liable to taxation under this chapter and either owned or controlled by or owning or controlling, either directly or indirectly, another corporation may be required by the Department to make a report consolidated with such other corporation showing the combined gross and net income and such other information as the Department may require, but excluding intercorporate stockholdings and the intercorporate accounts. In case it appears to the Department that any arrangements exist in such a manner as improperly to reflect the business done or the Virginia taxable income earned from business done in this Commonwealth, the Department may, in such manner as it may determine, equitably adjust the tax. In all cases mentioned in this paragraph, such other corporations not otherwise liable to taxation under this chapter shall, for the purposes of this chapter, be deemed to be doing business in Virginia through the agency of the corporation liable to taxation under this chapter.