A number of progressive reforms were carried out during Caprivi's time as Chancellor. The employment of children under the age of 13 was forbidden and 13- to 18-year-olds restricted to a maximum 10-hour day, in 1891 Sunday working was forbidden and a guaranteed minimum wage introduced, and working hours for women were reduced to a maximum of 11. Industrial tribunals were established in 1890 to arbitrate in industrial disputes, and Caprivi invited representatives of trade unions to sit on these tribunals. In addition, duties on imported timber, cattle, rye, and wheat were lowered and a finance bill introduced progressive income tax under which the more one earned, the more tax that person paid. Other achievements included the army bills of 1892 and 1893, and the commercial treaty with Russia in 1894.