whats the most inexpensive yet greatest invention?

United States
January 25, 2008 3:15pm CST
just curious to see what people thought was the most inexpensive invention which has brought in billions to its creators. a few examples: Post-It Notes and Duct Tape
1 person likes this
2 responses
urbandekay
@urbandekay (18278)
•
25 Jan 08
Undoubtedly, matches all the best urban
javmagik029
@javmagik029 (187)
• United States
25 Jan 08
thats a good point, matches are always something good to have handy but people are using lighters more and more. matches are more less a last resort to me when a lighter is out of fluid. i dont smoke though im just talking about campfires, grills, and house fireplaces. but good thinking
urbandekay
@urbandekay (18278)
•
25 Jan 08
Yes, I use lighters more too nowadays, since they are a few pence each here but matches were there first. all the best urban
Modestah
@Modestah (11179)
• United States
29 Jan 08
very inexpensive and found in most homes, though I would not think it qualifies as "greatest" they can sometimes be viewed as indispensable... the elastic (rubber) band.