"They're trying to find some way to add value to the physical product," said David Card, an analyst at Jupiter Research.

"It's really hard to do broadband video right now," said David Card, a media analyst with Jupiter Communications.

David Card has also made fundamental contributions to research on immigration, education, job training and inequality.

David Card, another economist from Princeton, compared men who grew up near low-cost colleges with those who did not.

Berkeley's David Card has studied this extensively with several papers, revealing the aforementioned results.

"This looks like a pretty good business," said David Card, a Jupiter analyst.

But David Card, an International Data analyst, said the new strategy could succeed.

David Card, a senior analyst for Jupiter Research, said that books and magazines suffered differently from online competition.

"It is slick software," said David Card, an analyst with Jupiter Research.

That same year, David Card realized that a test tube did exist.