I've long been interested in looking at the culture of consumerism and also was interested in this connection between the American dream and the house, and the house being kind of the ultimate expression of self and success.

My first book, Fast Forward, was about growing up in the shadow of Hollywood and how kids are affected by the culture of materialism and the cult of celebrity, and I've often felt the reason my work has an audience in the UK is because it's everything the British love to hate about the Americans.

These days, the media is defining what cultural capital is, and it's easily learned. If you have money, anything can be bought. We see this in China and Russia with what I call the "Bling Dynasty and New Oligarchy" in Generation Wealth. As people got rich and everybody started buying Louis Vuitton bags, it became clear that to distinguish yourself you had to have more than an expensive bag. People began to want the things that money is not supposed to be able to buy - history, tradition, education, and culture.

The economist Juliet Schor talks about how our reference group has changed over the last twenty-five years. As we spend less time with our neighbors, we're spending more time with people we know from TV and social media, and this becomes our new reference group. The media is full of images of people with wealth, and we're comparing ourselves to them and aspiring to what they have. Instead of keeping up with the Joneses family, we're trying to keep up with the Kardashians, even though it's completely unrealistic.

I've often looked at the extremes as a way to shed light on the mainstream. Even though everybody says, "Money doesn't buy you happiness," I don't think that that's the principle by which people live. If you talk to kids and ask them what they want to be when they grow up, they say, "Rich and famous," but being rich and famous is not a job.

When I first moved from photography to filmmaking, I was worried about how big I had to become. I was one person, or maybe me and an assistant, and I had these small cameras, and maybe a flash.

Race is a huge factor when it comes to income and social inequality, and it plays a role in the structural barriers you are talking about. But when you're in the upper echelon of the 1 percent - even though it's certainly a more white demographic overall - there are fewer barriers.