does this makes sense, The tMPL heory would suggest that this decline is a result of the law of diminishing returns, which suggests that hospital keeps adding more workers but doesn't increase the amount of other resources (like equipment or space), the productivity of each worker (measured as output per worker) will eventually start to decrease or in this case the MPL is negative which underscores the need to investigate the underlying issues affecting labor productivity within the hospital. What is difficult to establish whether other resources indeed have stayed fixed the study is unable to confirm that data and therefore is based on assumption that other resources are fixed. This assumption is appropriate give that the MPL is negative which would mean even if the other resources have increased it would suggest even worser labour productivity