BPI, of course, manufactures lean finely textured beef, the food product in question.

FORBES: Connect

Seeking feedback from your visitors is the beginning of Lean UX, the practice of creating the minimum viable product for your visitors.

FORBES: Get Feedback and Shake Up Your Site

That means the book is a product with a number of services attached and needs treating like any other lean start-up.

FORBES: Is This The Smartest Way Yet To Market A Book?

To the extent that couples are making choices that prompt one of them, in Ms. Sandberg's words, to "pull back" from high-powered careers rather than "lean in, " the dollars and cents of the nation's gross domestic product is reduced.

WSJ: The Economics of Leaning In