Why is the agricultural output of commodity grain low and the commodity rate high?

The low agricultural output of commodity grain is relative to the small-scale peasant economy (monsoon paddy field agriculture). Although mechanized production can increase the planting area to a certain extent, the output value per unit area cannot be finer than that planted by one household, so the output per unit area is low. Commodity grain agriculture is mainly based on large-scale mechanized production and has specialization; Regionalization, scale and commercialization are the main factors. To measure whether the agricultural type of a region is commodity grain agriculture depends on whether its products are circulated as commodities, so commodity grain agriculture has the highest commodity rate and is generally used for export, while monsoon rice agriculture is generally self-sufficient, so the output per unit area is high and the commodity rate is low.