Otherwise, it may reflect the changes in prices instead of productivity.
Measurement issue: The authors rely on the Latent Growth Curve Modeling technique to study the trend growth of China’s agricultural labor productivity. It is not clear, however, why the authors rely on a dataset with only 10-year period to discuss labor productivity trend growth issue instead of using a dataset with longer time period if data is available. In addition, the authors may want to justify their approach by briefly discussing the advantage or shortcomings of their method comparing to other approaches in identifying the growth trend of China’s agricultural labor productivity.