The rich, so called because they can afford not to work. The term was made current by the economist Thorstein Veblen in his book The Theory of the Leisure Class.
Examples from the Web for leisure class
Midway between these extremes lies the everyday speech of leisure-class conversation and literature.
Very fitly does Mr. Veblen, in his interesting book, call decorum "a product and an exponent of the leisure-class life."Bushido, the Soul of Japan|Inazo Nitob
This leisure-class function is not without an important bearing on the higher and on the spread of knowledge and culture.
It is rather that the leisure-class scheme of life here comes to an expression at the second remove.
This contention of the leisure-class spokesmen of the humanities seems to be substantially sound.