Economic Implications (Score 1)

I wonder if anyone has ever conducted a study on the economic implications of OSS. Money needs to change hands for jobs to be created. If, as some people seem to advocate, all software was OSS, how many paying jobs would be left in the industry? I know there would be service oriented and sys admin jobs but how many jobs would be created if $20 was exchanged for every copy of Apache in use today? I could be wrong but it seems like it must have some effect on the developer market.