the most effect on companies? Why? Do both public and nonpublic or not-for-profit organizations comply with the regulations of all regulatory bodies?...

Of the several regulatory bodies, which has the most effect on companies? Why? Do both public and nonpublic or not-for-profit organizations comply with the regulations of all regulatory bodies? Why or why not? Are there gray areas? How do companies assure compliance with regulations? How does your company comply? Any thoughts on how to streamline the regulatory process over accounting and finance?