“This is heavy” – Marty McFly, Back to the Future
Stock could mean actual stock of products or components. It could mean incomplete projects, untold stories, or ideas not yet recorded. Anything that has value only as part of a greater process or transaction can be considered stock.
Unsold goods require storage. Unfinished projects take care and attention. Ideas can be distracting until they’ve been noted. Some stories want and need to get out so much it can hurt to keep them in.
There are costs in each of these things. Reduce the stock and reduce the costs.