Based on the information provided, bananas are first shipped to distribution centers rather than directly to individual stores because:
1. **Efficiency:** Bulk shipping is faster and more efficient compared to direct delivery to stores. By consolidating shipments to distribution centers, it allows for larger quantities of bananas to be transported in a single trip, reducing transportation time and costs.
2. **Cost-effectiveness:** Bulk shipping is generally less expensive than direct delivery to stores. Distributing bananas to centralized distribution centers enables economies of scale in transportation, storage, and handling, which can lower overall shipping costs.
3. **Logistical convenience:** Stores may not have the capacity to handle entire bulk shipments of bananas directly. By sending bananas to distribution centers first, they can be efficiently sorted, stored, and then distributed in smaller quantities to individual stores as needed.
In summary, shipping bananas to distribution centers before reaching individual stores helps optimize the supply chain by improving efficiency, reducing costs, and ensuring a smoother distribution process from plantations to consumer tables.