… rising markets?
In rising markets the discount certificate tends to rise as well, with the cap marking the maximum possible return. This means that in the case of rising markets, the discount certificate gradually approaches its cap.
… stable markets?
In stable markets, discount certificates rise over the course of time while approaching the end of maturity. This happens because the discount of the certificate decreases until the end of maturity, at which point the price of the certificate equals the price of the underlying. This is a prime example of the sideways yield.
… falling markets?
In falling markets, the certificates fall as well. However, since the discount certificate was bought at a discount to the underlying, the loss is lower by the amount of the discount then it would be for the underlying.