Wiktionary
n. (context idiomatic English) efficiency; cost-effectiveness; value.
Wikipedia
Bang for the buck is an idiom meaning the worth of one's money or exertion. The phrase originated from the slang usage of the words "bang" which means "excitement" and "buck" which means "money". Variations of the term include "bang for your buck," "bang for one's buck," "more bang for the buck," "bigger bang for the buck," and mixings of these. "More bang for the buck" was preceded by "more bounce to the ounce", an advertising slogan used in 1950 to market the carbonated soft drink Pepsi.
The phrase "bigger bang for the buck" was notably used by U.S. President Dwight D. Eisenhower's Secretary of Defense, Charles Erwin Wilson, in 1954. He used it to describe the New Look policy of depending on nuclear weapons, rather than a large regular army, to keep the Soviet Union in check. Today, the phrase is used to mean a greater worth for the money used.
Usage examples of "bang for the buck".
The bigger bang for the buck theory is obsolete-we have all the bang we'll ever need.
Translation: more bang for the buck, and without a lot of spare change.
It was decided to streamline the operation, to get 'more bang for the buck,' I think the phrase of the day was.
I larded my account of my hopes for the future with casual references to owner-friendly buzzwords like 'point-of-sale', 'food cost percent', 'labor-intensive' and 'more bang for the buck', careful to slowly, almost accidentally reveal that I was a serious, experienced chef, a reasonable man-good-tempered, reliable-the sort of guy a fifty-five-year-old Scottish steakhouse owner could talk to, spend time with-a realist, a journeyman professional-without airs, illusion or pretense.