> Then pick which one of a, b, c and d you want to decrease, and look at whether competition can help. We already know the answer to this: competition can help

> Then pick which one of a, b, c and d you want to decrease, and look at whether competition can help. We already know the answer to this: competition can help decrease a and c, and even b and d might be fair game since competition in preventive care and preventive information can increase its effectiveness, which in turn reduces people's overall need for health care.