155Concerning the obligation to recover aid paid to a company in difficulty, it should be recalled that, as is apparent from the case-law, it may be extended to a new company to which the company in question has transferred part of its assets, where that transfer permits the conclusion that there is an economic continuity between the two companies. For a finding of the existence of an economic continuity, the following factors may be taken into consideration: the subject-matter of the transfer (assets and liabilities, maintenance of the workforce, grouped assets), the price of the transfer, the identity of the shareholders or the owners of the undertaking which takes over and of the initial undertaking, the time at which the transfer takes place (after the beginning of the investigation, the opening of the procedure or the final decision) or the economic logic of the operation (see, to that effect, Joined Cases T-415/05, T-416/05 and T-423/05Greece and Others v Commission [2010] ECR I-4749, paragraph 135).