This question has come up a lot lately, but The Economist gave it a new twist: Why do economists, who should know better, spend valuable time blogging for free?

Norm Geras has the best, most succinct answers:***

The question can be generalized to most of the rest of us. Why does anyone? Some of the answers provided by this piece: a place in the intellectual influence game; the sharpening of ideas; an extension of educational activity; having a voice. Of course, one can also question the question. People do a lot of stuff they don’t get paid for.

Indeed, as someone we all know would say.

————-

***My own, insufferably pompous answer (now edited to fix a typo), which I posted over at Jeff Jarvis’s place, is/was:

An open letter to “Someone We’d Know”:

We are longtime thinkers and readers and writers who went to the same schools as MSMers (No insult intended. Some of my best friends are MSMers.) but decided to pursue careers and professions other than journalism. We make our living doing other things, but we continue to read and to be engaged by the dynamic world around us and by the world of ideas. We like to read. We like to write. We like to make fun of what we observe in public life, like in MST3K. We like to debate. We understand rhetoric. We know how to check facts and sources.

It’s not journalism, though–few of us are out there bearing witness or interviewing people or acquiring other primary-source material (although with the advent of podcasting and various blogging consortia, that may be changing).

It’s…I dunno. Maybe blogging is “opinion reporting.”

We’re different from journalists, because we seek to mix it up with our readers. We’re looking for conversation and debate. We want to be involved in the intellectual/cultural life of our country (such as it is). Some of us are tired of shouting back at the talking heads on TV and NPR and at editorial writers and columnists. We have areas of expertise and opinions, too.

The blogosphere is where thinking people go to debate the politics of the day, the ideas of public intellectuals, and the opinions of paid opinion writers. It’s where the national conversation is taking place. Be there or be square.