Income for Bicycle shop workers overall is not high in the USA. Or for that matter in Europe either; however, a bike shop mechanic in Europe certainly has allot more respect than in the states. MUTA (Mechanics' Union of Trade Associations) puts San Fransisco bicycle mechanics at some of the highest paid workers in the USA at 30-35K. From what I hear that's not enough to live on in the Great SF...
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No matter where you're at... There you are... Δf:=f(1/2)-f(-1/2)