Why is compost taken from the bottom of the container?

Configuration (contained or uncontained piles) to employ, location (kitchen, yard) to select, materials (carbon- and nitrogen-rich indoor and outdoor recyclables), and uses (amendment, fertilizer, mulch) to prioritize are compost strategies. The term strategy refers to the realization of large-scale, long-term planning, all of which is involved in the above-mentioned decision-making.

Compost at the bottom of the container has been there longest and will be the most decomposed of the pile.