"Some say economics has all kinds of good tools and techniques, but it has an absence of interesting problems, " notes Roth, 58, who holds a joint appointment in the Harvard economics department and the business school.

FORBES: Magazine Article

There has been some speculation that both kinds of business model will be undermined by the rise of free social networks such as Facebook, which make it easy for people to share large amounts of personal information with one another.

ECONOMIST: Online dating

The syndrome has been linked to poverty and some kinds of depression.

BBC: Traffic noise 'could harm children'

And we have worked very closely with our international partners, most recently in Europe, in dealing with the kinds of challenges to recovering from the global recession that Europe has encountered, that in some way are similar to the ones that we did -- we encountered a few years ago.

WHITEHOUSE: Press Briefing