Sequence of returns risk is the risk that the timing of investment gains and losses—particularly when money is being withdrawn—can affect how long a portfolio lasts.

Collateralized Debt Obligations (CDOs) are structured financial instruments that pool together various income‑generating assets—such as mortgage‑backed securities, corporate bonds, loans, or other debt obligations—and redistribute the resulting cash flows to investors through tranches with differing levels of risk and return.

Mortgage‑Backed Securities (MBS) are fixed‑income financial instruments created by pooling residential or commercial mortgage loans and selling interests in that pool to investors.