"Society and the State must ensure wage levels adequate for the maintenance of the worker and his family, including a certain amount for savings. This requires a continuous effort to improve workers' training and capability so that their work will be more skilled and productive, as well as careful controls and adequate legislative measures to block shameful forms of exploitation, especially to the disadvantage of the most vulnerable workers, of immigrants and of those on the margins of society. The role of trade unions in negotiating minimum salaries and working conditions is decisive in this area."