Estimated average incremental cost and marginal cost for outpatient visits*. aic = average incremental cost mc = marginal incremental cost vertical line = average number of outpatient visits in the observed sample. *This graph is constructed holding all variables at their mean across facilities except for the number of child outpatient visits. We then predict the expected aic and mc for the outpatient volume observed at all facilities in our sample. The presented lines connect these predicted values.