Route 128 Had Three Times Silicon Valley's Tech Workforce in 1965. By 1975, Silicon Valley Had Already Pulled Ahead.
Economist Alfred Marshall described it in 1890 without fully explaining it: when an industry concentrates in one place, "the mysteries of the trade become no mysteries... but are as it were in the air." Route 128 had three times Silicon Valley's tech workforce in 1965 -- and lost the lead within a decade anyway.
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