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					Originally Posted by  Andrew H.
					 
				 
				I'm skeptical that he could make a living solely as a writer; not that he isn't talented, but he hasn't been very productive historically (in terms of producing books, I mean). 
			
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 Just to clarify, you don't need to necessarily be "productive" (as defined by producing books) to make a living as a writer. You could write one (or a few) book, and if they consistently sell well, you're good to go.
There are also the business endeavors that pop up due to your popularity (i.e. speaking engagements, movie deals, etc.), but I don't know if you count that. 
Here's an estimate breakdown of Doctorow's income a few years back: 
http://blog.fawny.org/2009/07/29/doctorow-income/