These measures might encourage members of Group B to move into the formal sector of the economy if this is the reason why members of this group are reporting very low earnings to the survey. However, it is debatable whether this is relevant to Group B: one third are self-employed and so will not be affected by this, and even for those who are employed its relevance is doubtful given that they report earnings of less than a third of the minimum wage prevailing during the reference period. Measures to reduce informal working have recently been introduced in Estonia. A national register of employees was introduced in 2014, which has been estimated to have increased formal employment by 9,000 and tax revenues by €5.1 million in its first few months.