If you are interested in an analytical article on the business and economic side of early safety razors, you may wish to read this piece from 1978 on Gillette and their business strategies that was printed in the University of Chicago Law Review.
http://lawreview.uchicago.edu/issues/backissues/v78/78_1/78-1-Razors-and-Blades Myth(s)-Picker.pdf
http://lawreview.uchicago.edu/issues/backissues/v78/78_1/78-1-Razors-and-Blades Myth(s)-Picker.pdf