Annie Lowrey wonders how we should measure "the value people derive from Wikipedia or Pandora" or other online products:

MIT professor Erik Brynjolfsson explains the idea using the example of the music industry. "Because you and I stopped buying CDs, the music industry has shrunk, according to revenues and GDP. But we're not listening to less music. There's more music consumed than before." The improved choice and variety and availability of music must be worth something to useven if it is not easy to put into numbers. "On paper, the way GDP is calculated, the music industry is disappearing, but in reality it's not disappearing. It is disappearing in revenue. It is not disappearing in terms of what you should care about, which is music."

As more of our lives are lived online, he wonders whether this might become a bigger problem. "If everybody focuses on the part of the economy that produces dollars, they would be increasingly missing what people actually consume and enjoy. The disconnect becomes bigger and bigger."