Productiveness is the virtue of creating material values. In a free market, such a virtue is a necessity, to trade. Competition is dependant on being the best, and therefore indirectly on the progress of competitors. Without productiveness, no progress is possible because progress is part of the development of the product. Progress is a product in itself.
Socialism is a system which is defined by governmental ownership of property.
The government can only own property if it takes it away from its rightful owner. This is because the redistribution of wealth must be made on a certain basis. By using force and forbidding them to use this property, it therefore also affects the right to liberty. The basic mistake is to differentiate between human rights and property rights, for one cannot exist without the other. Denying property rights is basically reducing people to being the property of the state, because the fruit of man's labour, which is property, is necessary for one's life.