Batch size refers to the specific quantity of units or products manufactured in a single, uninterrupted production run before equipment is stopped, reconfigured, or switched to produce a different item. This fundamental production planning parameter determines how many identical items are produced consecutively using the same setup, tooling, and process configuration. In logistics and supply chain management, batch size directly influences production efficiency, inventory levels, manufacturing costs, and the ability to respond to customer demand. The determination of optimal batch size represents a critical strategic decision that balances competing operational objectives, including minimizing setup costs, reducing inventory holding expenses, maintaining production flow, and meeting delivery requirements.

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