The most economically efficient companies in my career always make it insanely hard to add head count to the team. They tease you with "might get a head count next quarter". Then frequently freeze the head count during your search. They are trying to squeeze as much as they can. I'm not saying this is a pleasant working environment, but it is very good for the bottom line. Also, it is sometimes more efficient for them to give modest pay rises to best performers off-cycle to motivate them to work even harder.