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Re: Deriving economic profits from writing FREE software?

On Sun, Jan 18, 1998 at 10:27:10PM -0800, Bill Stewart wrote:

> There's the standard shareware model - ask for $25.
> There's the Cygnus model - charge money for support.
> There's the Netscape/McAfee/etc. model - free for personal use,
> 	charge money to companies that use it.
> There's the Eudora model - basic version free, bells&whistles extra.
> There's the advertising-banner model - the software/service is free,
> 	but usage hits an advertising banner in some way that
> 	filters money back to you.

Does anyone have any economic studies (or stories) which compare
the effectiveness of these approaches?