The findings of this study of the effects of health maintenance organizatio
ns (HMOs) have implications for consumers' choice between HMOs and other ty
pes of insurance: consumers face a trade-off that flows in part from the de
sign of HMOs. HMO enrollees get more primary and preventive care and face l
ower out-of-pocket costs, bur they get less specialist care, experience mor
e provider access and organizational barriers to care, and report less sati
sfaction, lower ratings of care, and less trust ill their physicians. Polic
ymakers should recognize that this trade-off will be attractive to some peo
ple but not to others.