Pretty much every mouse(pointer device) I've used is broken because one of it's clicking buttons stopped responding. When the pads on it's downwards side is worn out, a mouse gets difficult to move but it's still usable. When the buttons are broken it has to be thrown away. These parts are cheap compare to the optical module and should have no problem been made replaceable. The question is: why have them not already been made replaceable? By making it replaceable, we can keep the optical module alive, saving resources and work time needed to re-produce them. This should greatly increase the efficiency regarding to what we input and what we get. My sister says that sometimes even if we find a more efficient way of doing things, we can't do that because people will lost their job. Those saved cost usually end up meaning less work time is needed. This is indeed very true in life. My colleague did tend to get angry when I find better ways of doing things, they want the old ways even if a much efficient one is just out there, no one want's to lose their job. There is also a saying that corporations don't want to make their products too durable. Because if they do, they end up won't profit enough. It pretty much sounds like as a whole we just have to wast a lot so we can make a lot. What's the reason behind this? Selfish? Lack of good regulations? Or is it actually MORE EFFICIENT and I'm just blind?