Yes, industrialisation "spread" in the sense that it was possible to use an engine anywhere, but in practice most countries developed tightly clustered industri

Yes, industrialisation "spread" in the sense that it was possible to use an engine anywhere, but in practice most countries developed tightly clustered industrial areas (as in heavy industry being the predominant economic engine), while others areas of the country remained either agricultural or mercantile or service economies. The reality is that in any human endeavour (steel production, summer blockbusters, LCD screen manufacture, grunge, salmon farming, dadaism) there are clusters of activity - they do not preclude the activity being carried elsewhere, but the people who do carry out the activity at the cluster have both synergy gains, and act as a magnet so create a snowball effect. Obviously the SV is a cluster of excellence for startups. Why is this expected to have a social impact, even if they do represent a new economic phase? (which personally I doubt - the numbers of people involved are just too small). I don't get it.