ACTUALLY
The factors of 1984 was that Atari only had 60ish% of the market and 3rd party developers for Atari consoles had the other 40ish%.
The head honcho over at Atari being the shrewd buisness man he was thought if they made enough games to seel to 10% of the market like they had previously done that they would all sell.
Unfortunately (depending on your views) he was wrong. There where 1,000s of extra games just colecting dust on store shelves because people were not going to buy nearly as many titles as were sold nor were they going to buy more than they previously had just because all the extras were there(Until prices plummeted that is).
So everyone had to take losses many of which got knocked out of the industry because of said losses. The consumer was just not going to deal with a extra 60% of producaed games being thrown on the market that quickly.
I suggest you brush up on your classic gaming reading
... I suggest i do aswell i am not 100% on all of that but that is the basic gist of it. As for my percentages i will give them a +-5% margin.