This Demonstration shows the potentially hazardous long-term effects of propping up. An entity with the given capital seeks to maintain a constant proportion exposure to a financial instrument that trades with a fixed maturity. As time goes by, the entity experiences profits from the difference between the realized value of the instrument and the implied price at which it purchased it. The instrument is relatively illiquid, so each purchase or sale by the entity has an impact on the implied price. The plot of the evolution of the capital, the average maturity of the held instruments, the implied price, or the realized value is shown for the given number of years, assuming time steps of 1/days per year. The evolution is often a smooth bubble but when the capital reaches a critical value, discontinuities can result.