The Impact of Access Regulation on Health Insurance Market Structure. Results


The results of our analysis suggest that state insurance regulation has some impacts on health insurance markets. However, these effects differ in size and direction in the group and individual markets when the analysis controls for other circumstances, and they often have only weak statistical significance (90 percent). Moreover, our analysis indicates (in the one specification in which we tested dummy regulatory variables) that analyses that fail to account for the strength of state reforms are more likely to detect significant regulatory impacts than analyses that do account for them. In all tests, state effects are highly significant. Typically, year effects (usually over the two-year span of the data) are also significant. These results for the group and individual markets, respectively, are reported in Tables 11 and 12, and summarized below.