I am wondering why standard US keyboards allow you to type - by simply hitting the key, but the + button right next to it needs the Shift key. The default for that key is = and not a minus symbol. + and - are similar operations, which has led me to wonder why they are reversed in their dependence on shift. Is there any reason I am not thinking of which would have lead to this choice?
Answer
Well, you are, obviously, talking about the section of the keyboard whose main function is to write letters for words and sentences, because on the right side of the keyboard, both signs can be used without the shift key.
Going back to your question, the difference is related to the different uses that the dash symbol has on normal writing and the lack of use of the plus sign on the same circumstances.
You can read more about that on the dash page on wikipedia.
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