Using borrowed money to increase the return on an investment. Example: Property is purchased for $100,000 cash and sold one year later for $150,000. The investment produced a return of 50%, less the cost of sale. Another property is purchased for $100,000 with $10,000 down and a $90,000 mortgage and sold one year later for $150,000. The investment produced a return of 500%, less the cost of sale and cost of the mortgage, still a much higher return than the cash purchase.