The 1970s were the height of social mobility. College was accessible. My grandfather was a poor immigrant who went to a public school in Ohio, and my father went to Harvard. That wasn't unusual. There was a feeling that anything was possible and you didn't have to be born into money to have a successful life. Now, people don't believe in the idea that anything is possible. We have more inequality than we've had ever before and a greater concentration of wealth in the hands of a few.

I've been a documentary photographer for much longer than I have been a filmmaker.

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.

All my film ideas and subjects have come from photography.

You have these relationships with people that you care about, but I also try to stick to my job as filmmaker and be fair and truthful about what I saw and my experience of the people, hopefully informed by a deep understanding of them.

I'm also looking for the psychological elements that fuel commodity culture. For example, if we imbue girls with deep insecurity about their bodies through images of an impossible ideal, we create a really vulnerable and avid consumer. If somebody feels that they're not OK without a certain product, you have a very deep and loyal market that will come back to the product again and again. Sometimes, this process is both rational and irrational.

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.