Banking-many members of this family, including Grandpa Prescott, Jonathan Bush, and William H. T. Bush, are or were involved in banking.
Investment-this is probably the biggest and most general one. I think most, if not all members of the BFEE are involved in investment, and part of the predatory Investor Class. Marvin Bush is a good example of how much money a Bushie can extract out of predatory investments.
War profiteering-goes back to Samuel P. Bush and George H. Walker in World War I, then Prescott Bush funding the Nazis in WWII, and George H. W. Bush through his roles as a CIA agent, director, as as Vice President (Iran-Contra). Also, Jeb, Marvin, and Neil Bush all profit from the Wars in Iraq and Afghanistan, and the War on Terror in general; so does uncle William H.T. Bush.
Education-Neil Bush, through Ignite! Learning.
Health insurance-William H. T. Bush is on the board of WellPoint. Also, Jonathan Bush's son Jonathan S. is CEO of athenahealth.
Oil-obviously, George H.W. Bush is involved in this one, and so are his sons, through investments that have included connections to the Saudi royal family and the bin Laden family.
Intelligence: both Prescott Jr. and H. W. are connected to the intelligence community extensively. H. W., in particular, was in Dallas on 11/22/1963, but can't remember where...
Real estate-Jeb ran a real estate firm before he entered politics, probably still makes money off of his connections there.
And
politics, the ultimate for-profit business; Prescott, George H.W., and George W. and Jeb have been Senators, Governors, and Presidents.
Know the BFEE....