Research about measuring agricultural productivity is hugely important, but can I ask why we're still talking about the farm size-productivity relationship? Redistributive land reform isn't a policy issue anymore. Large scale agricultural investment is, but variations in productivity over the existing land distribution would tell us very little about how an investor with vastly different access to capital and technology would fare. Not to mention, does anyone expect that we're going to find a farm size-productivity relationship that's generalizable across contexts in any meaningful way?
Meanwhile, there is still hundreds of millions of dollars being spent on research looking at agricultural productivity using household-survey based measures. It would be tremendously valuable to know what these findings say about that- are there adjustments that should be made to these datasets? Do we need to be using higher-cost approaches to measurement, with fewer studies as a result?