I would have to say that is the military. It is not the best job, but it is always going to be there.
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Apple stores are America's most profitable retail operation. Not sure about California exclusively.
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The food service industry seems to be the most popular and profitable catering to the tourisim of the state.
The AT&T is the most profitable phone company in North America based on their post of their net income as being $19.9 Billion in 2010. They also recently acquired T-Mobile for $39 Billion.
Sugar cane and coffee.
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Rice was the most profitable cash crop.
RIL is the most profitable compnay in india 2011...
The most profitable crop in the south was Cotton .
The most profitable crop for now is corn.
Some of the most profitable mortgage companies in the US, are: Bank of America, Wells Fargo Mortgage, CitiMortgage, U.S. Bank Home Mortgage, and Sun Trust Bank.