Article 61 (Private enterprise, cooperatives and worker management) 1. Private economic enterprise shall be undertaken freely within the overall frameworks defined by the Constitution and the law and with regard for the general interest. 2. Everyone is accorded the right to freely form cooperatives, subject to compliance with cooperative principles. 3. Cooperatives must pursue their activities freely within the overall framework of the law and may group together in unions, federations and confederations and other forms of organisation provided for by law. 4. The law shall lay down the specific organisational requirements for cooperatives in which any public entity possesses an interest. 5. The right to worker management, as laid down by law, is recognised. Article 62 (Right to private property) 1. Everyone is guaranteed the right to private property and to the transmission thereof in life or upon death, in accordance with the Constitution. 2. Requisitions and expropriations in the public interest may only be undertaken on a legal basis and upon payment of just compensation. CHAPTER II Social rights and duties Article 63 (Social security and solidarity) 1. Everyone has the right to social security. 2. The state is charged with organising, coordinating and subsidising a unified and decentralised social security system, with the participation of the trade unions, other organisations that represent workers and associations that represent the other beneficiaries. 3. The social security system shall protect citizens in illness and old age and when they are disabled, widowed or orphaned, as well as when they are unemployed or in any other situation that entails a lack of or reduction in means of subsistence or the ability to work. 4. All periods of work shall, as laid down by law, contribute to the calculation of old age and disability pensions, regardless of the sector of activity in which they were performed. 5. With a view to the pursuit of the social solidarity objectives that are particularly enshrined in this Article and in Articles 67(2)(b), 69, 70(1)(e), 71 and 72, the state shall, as laid down by law, support and inspect the activities and modus operandi of private charitable institutions and other not-for-profit institutions that are recognised to be in the public interest.