Silicon Valley is built on social capital, but it is social capital of a fu
ndamentally different type from the concept of "deep civic engagement" that
has come to dominate development theory and to influence policy. Social ca
pital in Silicon Valley is best understood as performance-based trust. It e
merges among economic and institutional actors in the pursuit of objectives
related specifically to innovation and commercialization. In Silicon Valle
y the sequence runs from performance to trust, not from community to trust
as the civic engagement theorists would have it. Silicon Valley is an open
society-open to ideas, to institutions, and especially to people. Community
-based trust implies a closed society. The openness of Silicon Valley to fo
reigners is one of the region's most valuable assets; it has also been the
best social capital investment for the home countries.