Monetary reform in 1953 was prepared under supervision of soviet advisors. One of its goals was a breaking of a financial force of private craftsmen, traders of house owners because they were seen as a part of so called exploitation class.
These social groups and other private groups should be eliminated and for this reason a set of tax laws with very strongly progressive tax burden was accepted at the end of 1952. This step should break efficiency of private business and sped up destruction of private business in crafts, services or agriculture.