This is incorrect... there are many examples, the light bulb is just the best documented, partly because of it's historical timing.
Another poster mentioned the DRAM case, this is one of a fairly good number of examples of collusion. When you are talking about a type of behavior that people will generally go to good lengths to keep under wraps, a better conclusion would be that the known cases are a fraction of the actual cases.
If we had something closer to perfect competition there would a lot less of this... but we don't. Many of the cases where antitrust action has been deemed necessary by governments were IMO caused by government interventions in the first place.
Another poster mentioned the DRAM case, this is one of a fairly good number of examples of collusion. When you are talking about a type of behavior that people will generally go to good lengths to keep under wraps, a better conclusion would be that the known cases are a fraction of the actual cases.
If we had something closer to perfect competition there would a lot less of this... but we don't. Many of the cases where antitrust action has been deemed necessary by governments were IMO caused by government interventions in the first place.