The department of Health and Human Services wants to make carriers pay for all program costs.

An Aetna executive said some co-op rates may be irrational.

Aetna wants them. Bloom Health has them.

Some think buyers should have major medical coverage. Others disagree.

An economist says only 42 percent of non-group holders keep coverage for 12 months.

Producers helped only 7 percent of the state's new Medicaid enrollees.

Oliver Wyman analysts say HHS could underpay for low-risk enrollees.

Harvard Pilgrim shows the impact of the extra costs in a small-group filing.