system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How exactly will obamacare lower the cost that that hospitals charge the insurance companies for an ER visit?
gpt
A) If everyone is covered, ER costs don't need to make up for uninsured people.  Hospitals are required to treat everyone that comes into the ER, regardless of ability to pay.  The hospital has to write-off the cost & take the extra money from people that are paying (if you're following along at home, this is effectively socialism)

B) When everyone's covered, it becomes reasonable for people to go to the doctor *before* it becomes an emergency.  If a patient is treated earlier, before a condition is serious, it can often be prevented at a far lower cost than dealing with a critical situation.  Keeping people healthy keeps the overall cost of healthcare lower.