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raiden55 Her advice is very situational, from a capitalist perspective the workers would invest their profits into tools that would improve their productivity. That improved productivity would allow the workers to achieve their previous workload with more free time to spare. The workers could then use the free time to work on side crafts or increase their workload in other areas to potentially generate more revenue.
However, like you mentioned, the assumption that the workers would use their spare income to invest in tools, etc and the assumption that free time would not be spent idle is not guaranteed.
Idleness was something pretty uncommon in feudal societies where the reigning lords would push people close to their limits in order to prevent idleness. Idleness in one perspective is lost productivity; however, in another perspective idleness is opportunity for individual effort and innovation.
It is certainly not a short-term solution and it is from a capitalist perspective which would be unrealized in a feudal society. Some people may be itching to replace/acquire new tools, renovate their home, etc while others would just drink and eat instead.