Question in "The Concept of Relative Surplus-Value"

Hey y'all, I'm reading Capital for the first time and I'm a bit hung up on this one quote near the end of the chapter The Concept of Relative Surplus-Value (page 436 of Penguin edition).The value of commodities stands in inverse ratio to the productivity of labour. So, too, does the value of labour-power, since it depends on the values of commodities.I can't figure out if he's saying that labour-power's value depends on the value of the commodities it produces, or rather depends on the value of the necessary commodities for the subsistence of the worker? Sorry if I'm totally reading this wrong lol. Any clarification appreciated! via /r/communism https://ift.tt/2Fuq3ya