Does Open Source really increase concurrency and lower prices?
Linux haven't stopped Microsoft from being lazy and selling ancient WinXP during 00ies. And Windows 7 haven't produced any significant advantage, like Microsoft's other projects, like Singularity, promised. Software still being written using C/C++ and segfaults on you.
Other example are gaming consoles: XBox360 costs less than PS3, despite PS3 using more open source components.
This leads us to conclusion that Open Source movement doesn't push technology forwards.