4. A worker is entitled to benefit from financial assistance in respect of economic stabilization if he:(1) is unable, as a result of an accident, an occupation disease or an aggravation, to carry on his usual employment;
(2) carries on other full-time or part-time employment;
(3) derives from the other employment an income that is less than the income that he derived from the employment that he became unable to carry on as a result of an accident or an occupational disease or, in the case of an aggravation, that is less than the income used as the basis for computing his indemnity for permanent disability, where that is the case, or otherwise, as the basis for computing his indemnity for temporary disability; and
(4) does not receive an indemnity for temporary total disability.
For the purpose of making the comparison referred to in subparagraph 3, the income that a worker derived from the employment that he became unable to carry on shall be revalorized each year in accordance with sections 10 to 14.