When I was a kid in the 1940's and '50's most people had a box camera. It usually made 8 exposures on a roll of film. There'd be a Christmas picture, a shot or two of the kids in their Easter outfits, maybe a graduation picture, and the roll would get finished over the summer. Kodak made film in sizes like 828, 118, 122, 116, 616, 127, 120, 620, 35mm, and probably others as well. There were a lot less people around back then. Kodak in the U.S. had competition from DuPont and Ansco. It'd be interesting to find out just how many rolls of film Kodak sells now (including single use cameras) compared to what they sold in 1950. My guess is that they're selling more per month now than they used to sell per year back then. In the last year or so both Kodak and Fuji introduced new lines of pro color films, and not too many years ago both Ilford and Kodak introduced "tabular grain" films like T-Max while keeping Plus-X, Tri-X, etc. on the shelves. Fuji updated their line-up. Kodak has invested many, many millions in Chinese film production. Somebody is buying film.