Open Sesame!

Redundancy is annoying.  I'm very forgetful, and oftentimes will lose a homework assignment, when I do, it really stinks, because I have to do it all again from scratch.  And being the procrastinator I am and already having a lot of homework, it's very difficult and lame.  I already did it once and learned what I needed to learn, so why should I have to do it again? Open source code exists for this very reason.  It helps programmer in a professional setting and prevents them from wasting time and allows people to share their work with the world.  However, I don't think everything should be open source, because then people would stop making money, and then the market for computers and programs would die (or be really maimed).  This would be caused by the lack of desire to improve and maintain them would disappear.  So we need both.  But what should be open source, and what shouldn't?  That's a very tough question.  Very tough.  A simplistic and cheesy answer suggests that anything not already being commercially advertised.  Or even simple code that just helps write some functions that can be kind of tricky, but I don't really know.  I'm just grateful some people do!  Because it makes my (professional) life easier and prevents me from making the "I love <3 redundancy!" mistake.  So, we need both kinds of code to make the world go round!