"What if someone wanted to curry favor and changed a number or two, or deliberately chose only the best locations? How would we deal with that?" Previously, Chen Xi might have pretended not to see anything, but now that won't do. In such cases, a single error in the data could be enough to doom the people of an entire province.
"Classify the harvests into normal years and years of disaster, and treat bumper years as normal years. Use the average grain yield of the last normal year as the benchmark for the current normal year's yield, and for the third normal year, take the average of the previous two normal years, and so on." Liu Ye had certainly considered the drawbacks of this method. With his divergent thinking, he would definitely view the situation from multiple angles to ensure that there were no severe loopholes. This method of taking the average from across the realm may be cumbersome, but its advantage lies in its stability.