"This is a very significant overturning of Chevron deference, which has been a cornerstone of administrative law for the past 40 years. Some key points about the implications:

1. It fundamentally shifts power from executive agencies to courts in interpreting ambiguous statutes. Courts will now have primary authority to interpret statutory ambiguities rather than deferring to reasonable agency interpretations.
2. It opens up many existing agency regulations and interpretations to potential new legal challenges. Regulations that were previously upheld under Chevron may now be more vulnerable.
3. It will likely make it harder for agencies to issue new regulations or take new regulatory actions, as they will have less latitude in interpreting their statutory authority.
4. It may lead to less stability and consistency in regulatory policy, as different courts may reach different interpretations of statutes.
5. It could slow down the regulatory process, as more issues may end up being litigated in court rather than deferred to agency expertise.

Some areas that may see significant impacts:

1. Environmental regulations (EPA, Dept of Interior, etc.)
2. Healthcare regulations (HHS, CMS)
3. Financial regulations (SEC, CFPB)
4. Labor regulations (DOL, NLRB)
5. Immigration policies
6. Telecommunications regulations (FCC)

Regulations that rely heavily on agencies filling in statutory gaps or interpreting broad statutory language are most likely to be affected. Major Obama and Biden-era regulations on issues like climate change, healthcare, and financial reform may be particularly vulnerable to new challenges.

However, the majority opinion does state that prior judicial decisions upholding agency actions under Chevron should not necessarily be overturned based on this ruling alone. So there is some effort to limit the disruptive impact, though the dissent expresses skepticism about how effective that will be in practice.

Overall, this represents a major shift in the balance of power between the executive and judicial branches when it comes to administrative law and regulation. The full practical implications will likely take years to play out through new litigation and regulatory processes."