1. Every person has the right to practice any profession or to carry on any occupation, trade or business.
2. The exercise of this right may be subject to such formalities, conditions or restrictions as are prescribed by law and relate exclusively to the qualifications usually required for the exercise of any profession or are necessary only in the interests of the security of the Republic or the constitutional order or the public safety or the public order or the public health or the public morals or for the protection of the rights and liberties guaranteed by this Constitution to any person or in the public interest:
Provided that no such formalities, conditions or restrictions purporting to be in the public interest shall be prescribed by a law if such formality, condition or restriction is contrary to the interests of either Community.
3. As an exception to the aforesaid provisions of this Article a law may provide, if it is in the public interest, that certain enterprises of the nature of an essential public service or relating to the exploitation of sources of energy or other natural resources shall be carried out exclusively by the Republic or a municipal corporation or by a public corporate body created for the purpose by such law and administered under the control of the Republic, and having a capital which may be derived from public and private funds or from either such source only:
Provided that where such enterprise has been carried out by any person, other than a municipal corporation or a public corporate body, the installations used for such enterprise shall, at the request of such person, be acquired on payment of a just price, by the Republic or such municipal corporation or such public corporate body, as the case may be.