> For thousands of years, in some written languages, there was no space between words. People were expected figure out sentences and clauses while reading aloud. Really?! Addingspacesbetweenwordsseemslikeanobviousthingtodo. According to Wikipedia, spaces weren't added because: (1) Free form of speech is so continuous, adding inaudible spaces to manuscripts would have been considered illogical. (2) At a time when ink…
I suspect a major reason not listed is inertia: people were used to reading without spaces between words, and never considered the alternative. With some help from reason #2, the increased cost.