No need to be dismissive - simple financial instruments are only obscure to those who willfully remain ignorant.
Your parent post's statement is a reference one of the basic financial models in asset pricing literature, the "Merton model" (Merton RC. 1974. "On the pricing of corporate debt: the risk structure of interest rates." J. Finance 29:449–70)
Your parent post's statement is a reference one of the basic financial models in asset pricing literature, the "Merton model" (Merton RC. 1974. "On the pricing of corporate debt: the risk structure of interest rates." J. Finance 29:449–70)