Thanks for downloading analysis from the BBC. David Baker asks if the values held by the

tech visionaries of Silicon Valley are affecting us all.

I'm in San Francisco, California on one of the city's famous cable cars heading

down towards Union Square. Since 1849, when huge amounts of gold were discovered in the hills to the north of here

people have been coming to this spectacular city to make their fortunes and the world a better place. This is where feminism and gay rights really

got going, where hippies set up communes to create a new utopia and where singers

like Scott Mackenzie preached a message of goodwill to everyone.

If you're going to San Francisco is home to a different kind of gold rush.

Just an hour's drive south of here is Silicon Valley, home to some of the most successful companies on Earth. The area has more

millionaires than pretty much anywhere else on the planet and like the hippies, these high-tech pioneers also the world.

I'm David Baker, and in this edition of analysis, I'll be investigating Silicon Valley's values

and asking what effect these giant companies are having on the way

we live and work across the globe. Silicon Valley is an extraordinary place, a global powerhouse that has given birth to a new industrial revolution.

The people who work there are hugely entrepreneurial.

They have an unbridled faith in the power of technology

to solve the problems we face today.

And they have an almost utopian mission to make the world a better place,

and although they might not put it this way, to make us more like them.

So where do these values come from?

To find out, I drove an hour south of San Francisco to a place that has become the spawning ground of Silicon Valley's identity.

This is Y-Conbinator, the Harvard of Silicon Valley. And this is the place about a hundred companies every year are successful.

And we're here to see Kasai Yunus,

...