The point of a pull system is to use a kanban board to limit work-in-progress by pulling from the previous phase of your value stream when necessary.

拉动系统的要点是在需要的时候通过拉动前期的价值流，利用看板来限制在制品的数量。

youdao

If the value of work in progress (or stocks, components) has risen strongly then the first story is more likely to be true.

FORBES: Which Way Are Apple's Results Going To Go? One Tiny Technical Point To Watch

If the value of stocks or work in progress has fallen (obviously, both need to be measured as a portion of sales, not just as simple levels) then the second answer becomes more likely.

FORBES: Which Way Are Apple's Results Going To Go? One Tiny Technical Point To Watch