Which factor is NOT known to contribute to insurer insolvency?

High reserve levels are generally considered a sign of financial stability rather than a contributing factor to insurer insolvency. When insurers maintain high reserve levels, it indicates that they are adequately setting aside resources to cover future policyholder claims. This practice is essential for ensuring that an insurer can meet its obligations when claims arise.

In contrast, rapid premium growth can lead to insolvency if it is not managed properly, as it may result in an underestimation of risk or inadequate reserves. Excessive competition leading to lower prices can pressure profitability and sustainability, causing financial instability. Similarly, fraud can significantly deplete an insurer's resources and affect its bottom line, ultimately threatening solvency. High reserve levels, therefore, are protective measures that bolster the insurer's financial health, distinguishing them from the other factors that can jeopardize an insurer's financial conditions.