I just ordered a box of 16 Harry's razor blades. It's not because they are great blades but because they are simple and cheaper than modern Gillette blades. That got me to thinking, always a bad sign, and on to the Google.
My first line of thought was how the stainless steel Wilkinson Sword Steel blades changed the U.S. market in the early 60's. Kinda like A2 changed the market for chisels and other cutters from being able to have an incredibly sharp iron that may not stay sharp a long time to one where sharpness is ok but stays that way much longer than the O1 cutter.
Getting on Google to refresh my memory and looking for the cost of mid 60's Gillette razor blades was enlightening, I knew about the cult following of straight razor folks with forums and such (kinda like woodworkers 😆) but there are also folks that buy and use NOS razor blades and post about the merits of the different makes and brands. It is a strange world out there but I guess no different than my strange world.
BTW, the cost of the Harry's razor blades was just under $2 USD a blade and they will give an ok shave for maybe a week. A pack of 10 Gillette Blue Blades in 1965 cost $1 USD. In real 2019 dollars that is $8 USD or about $.80 USD a blade/shave. The cost/benefit is still about where it was in the 60's. If you could buy new Gillette Blue blades at the same price in real dollars a week's shaves would be about $4 USD vs. $2 USD for the Harry's blades. A really nice smooth shave for about twice the cost of an ok shave. The market spoke.