In part because of the attempted indexation of wages, inflation reached 900% by the end of 1989, but was soon dealt with by means of radical methods. In December 1989, the Sejm approved the Balcerowicz Plan to transform the Polish economy rapidly from a centrally planned one to a free market economy. The Constitution of the Polish People's Republic was amended to eliminate references to the "leading role" of the communist party and the country was renamed the "Republic of Poland". The communist Polish United Workers' Party dissolved itself in January 1990. In its place, a new party, Social Democracy of the Republic of Poland, was created. "Territorial self-government", abolished in 1950, was legislated back in March 1990, to be led by locally elected officials; its fundamental unit was the administratively independent gmina.