An item that is output for one producer can become an input for another producer.

### Why this is right The note uses maize as an example: it is a farmer's output and becomes an input for a feed miller. Whether something is an input or output depends on the production process being considered. ### The concept Production is the transformation of inputs into outputs. Goods can move through successive production stages, so the same commodity may occupy different roles in different firms. This prevents treating input and output as permanent labels attached to an item. ### Remember Input or output describes a role in a particular production process.