The XX Factor: What women really think.

More on the Terrible Horrible No Good Billable Hour

Judith, you nailed the efficiency vs. availability conundrum. I'm sure there is room for law firms to dethrone The Hour—and here's a good recent Slate piece by Lisa Lerer explaining why the push for them to do so is coming from their clients. Perhaps most law firm work could be judged in terms of who does good work fast instead of who posts the most 12-minute increments. But for reality's sake, I feel compelled to recognize that sometimes, availability is the golden egg. Some clients see premium value in being able to reach their lawyer at all hours, and that's why the firms cater to this demand. It's possible that the market overvalues availablity—I'd like to think so—but I'm not sure. (Anyone got any good evidence on either side?)

One more point: In her new book The Sexual Paradox, Susan Pinker writes about studies of academia that mirror the finding that intense career paths play out differently for men and women. In a large study of the University of California system, Mary Ann Mason and Marc Goulden found that married male scientists have a productivity edge over married female scientists, and over single people. For one thing, many more of the men have stay-at-home spouses.