This document discusses two affiliate marketing scenarios and calculates their returns on investment (ROI). The first scenario earns $19 in profit from a $100 sale with 5% refunds, for a 19% ROI. The second scenario earns $19 from the initial sale plus $40 from $10 monthly commissions for 4 months, totaling $59 and a 59% ROI. The document advocates promoting products with recurring residual income, like the second scenario, to build multiple small income streams into a large, reliable flow of residual income over time.