Explain the main characteristics of 'extensive commercial grain farming' in the world.
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Remember the key yield paradox of extensive farming:
$$\text{Yield per Hectare} \rightarrow \text{\textbf{Low}} \quad \text{vs.} \quad \text{Yield per Worker} \rightarrow \text{\textbf{High}}$$
This is the exact opposite of Intensive Subsistence Farming (e.g., rice cultivation in Asia).