One problem with this approach: if there are transaction costs to identifying, evaluating, and funding interventions, then you would optimally ignore interventions that are below some scale. (And we can think of scalability as lack of diminishing returns.)
One problem with this approach: if there are transaction costs to identifying, evaluating, and funding interventions, then you would optimally ignore interventions that are below some scale. (And we can think of scalability as lack of diminishing returns.)