The danger of the 401(k) plan is if the contributions are not diversified, particularly if the company had strongly encouraged its workers to invest their plans in their employer itself. This practice violates primary investment guidelines about diversification. In the case of Enron, where the accounting scandal and bankruptcy caused the share price to collapse, there was no PBGC insurance and employees lost the money they invested in Enron stock. Congress inserted trust law fiduciary liability upon employers who did not prudently diversify plan assets to avoid the chance of large losses inside Section 404 of ERISA, but it is unclear whether such fiduciary liability applies to trustees of plans in which participants direct the investment of their own accounts.
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