An unnamed investment bank holding enough of its own subprime-mortgage-based securities on its books to more than erase the firm’s entire market value should those derivatives lose only 25% of their value. What to do? In Margin Call (2011), the CEO, played by Jeremy Irons, makes the call—the firm’s traders are to unload the entire asset class the next morning. Kevin Spacey’s character has two major objections—one normative and the other operational. The marginal place of ethics on Wall Street is well illustrated by how these objections pan out in the film.
From: "Margin Call"