“…15,16 Hospitals have substantial control over the price, quantity, and quality of their inputs and products. 19,20 Manthous worries that higher wages may constrain hospital activity in dimensions that benefit patients, for example, by reducing the number of patients served or the quantity or quality of nursing and other inputs. 17 The classic complaint against unions is that by controlling the labor supply they can demand higher wages than would occur in a competitive labor market.…”