WASHINGTON — With Tuesday's actions, the government has extended itself so far into every corner of financial services — investing directly in banks; buying unlimited amounts of commercial paper; and guaranteeing bank debt, interbank funding, and all noninterest-bearing deposits — that many observers said any eventual unwinding of the interventions would be so complex that some parts may never go away.

Even regulators acknowledged that some elements — such as the Federal Deposit Insurance Corp.'s decision to back bank debt — could be particularly difficult to reverse.

Subscribe Now

Access to authoritative analysis and perspective and our data-driven report series.

14-Day Free Trial

No credit card required. Complete access to articles, breaking news and industry data.