its a simplified example, where the boss of the worker can barely break even and depends on the surplus he gets from waged labor to make a profit, machines let the worker make more product in less time, which means, for less wage and gives him more surplus
in the case the machinery would let the worker make 100 chairs for 1g instead of 2, then the exchange value for 100 chairs would go from 950g to 901g and the time to produce them would go from 50 days to just 1
EDIT: if the change of machinery is sudden then the boss can get away with still selling 2 chairs for 19g and have 49g as surplus a DAY, until market pressures take his surplus away
if the worker was eliminated you could cut time shorter and shorter but not reduce cost through wage labor, and in a saturated market competition would barely let you break even
its a simplified example, where the boss of the worker can barely break even and depends on the surplus he gets from waged labor to make a profit, machines let the worker make more product in less time, which means, for less wage and gives him more surplus
in the case the machinery would let the worker make 100 chairs for 1g instead of 2, then the exchange value for 100 chairs would go from 950g to 901g and the time to produce them would go from 50 days to just 1
EDIT: if the change of machinery is sudden then the boss can get away with still selling 2 chairs for 19g and have 49g as surplus a DAY, until market pressures take his surplus away
if the worker was eliminated you could cut time shorter and shorter but not reduce cost through wage labor, and in a saturated market competition would barely let you break even