Catch-up System

I was just surfing a bit throughout the forum, and I found a very interesting idea wich in my opinion would make the game much more realistic and fun:

An "catch-up" system

This is a system where the cost of each tech is reduced by some % for each known Civ that's already researched it. Unless you're a tribe living in total isolation, you're going to learn things from your neighbors, whether they are friendly or not. And especially if they're fighting you. Trying to fend off Tanks with Muskets isn't something that would continue for very long.

Good or Bad idea?

(All credit goes to forty2j, this was his idea)
(Post found in "Technology breeds War, and War breeds Technology.")

Already exists:

http://forums.civfanatics.com/showthread.php?t=389938

Reasonably good idea. It may exist in mod form, as Sneaks mentions, but it isn't in the default game. It would have the side effect of discouraging beelines. I'm not sure if that's a good or bad thing, but it would be an effect!