Table 12 translates the bids into average per-enrollee premium and OOP spending gures analogous
to those in Table 11. The rst three columns are repeated from Table 11 for ease of comparison:
these are the baseline, the lowest-cost plan and the no inattention scenarios, all holding
prices xed. Column 4 reports the results when we allow plans to re-optimize prices. Simulated
premiums are lower than the xed price level in every year for two reasons: the dierence between
observed and simulated bids, which increases every year (Table 13), and the fact that enrollees
choose low-premium plans (particularly when inattention has been removed)46.
These results indicate a large supply side response to the simulated changes in consumer behavior.
While removing inattention resulted in only small reductions in costs, once premiums are
allowed to adjust the savings are substantial. Plans respond to the newly attentive, premium-