Partial wealth refers to the use of time to engage in a small sideline or part-time job after work, to be clever, or to earn money by playing side doors.
A windfall is a large sum of money you get by doing things other than work. Horizontal is an enhanced version of some wealth, which may be obtained by using the power in your hand for nothing or illegally. As the ancients said, "A horse without night grass is not fat, and a man without windfall is not rich".