eat what you kill
n. In business, the belief that a person who accomplishes something should get the full financial benefit that results from that accomplishment.
Other Forms
In addition, "eat what you kill" compensation systems may have aggravated the temptation to give client-pleasing advice. These systems have made individual lawyers more dependent on particular clients.
—Albert W Alshuler, “Lawyers and truth-telling,” Harvard Journal of Law and Public Policy, December 01, 2003
Most big public companies are run by professional managers who try to foster a cooperative spirit, said Jannice L. Koors, a vice president at Pearl Meyer & Partners, a consulting firm in New York. They tend to link the pay of executives who are responsible for particular lines of business more directly to overall corporate performance than do firms on Wall Street, Ms. Koors said.

"Wall Street has more of an eat-what-you-kill mentality," she said.
—Patrick McGeehan, “Sometimes the Boss Wasn't Paid the Most,” The New York Times, April 06, 2003
1987 (earliest)
One factor that may become very important is security. Clearly, the fast-growing institution that features the "eat what you kill" ethic is not designed for, nor will it be expected to provide, long-term security. The question is whether the young and immortal will factor long-term security considerations into their short-term planning.
—Joseph Klock, “Collegiality Revisited,” The American Lawyer, September 01, 1987
This phrase comes from the hunting ethic that says a person shouldn't kill anything he or she doesn't plan on eating. Naturally enough, it was taken up in its more general sense by lawyers, who used it to mean that an individual's earnings should be based on how much business that person brings to the firm. The phrase is now quite common throughout the business world.