Định Nghĩa và Ý Nghĩa của "bang for {one's} [buck]"

What is the origin of the idiom "bang for one's buck" and when to use it?

The origin of the idiom "bang for one's buck" is not entirely clear, but it is believed to have originated in the United States in the mid-20th century. This phrase is used to describe the value, benefit, or impact obtained in exchange for the money spent or invested.