CISOs already know that cybersecurity is a core competency of their businesses. Other executive leaders, however, may not. This is often in part because security leaders fail to highlight how many externalities force security spending. Those externalities include customers, cyberinsurers, and regulators. This report outlines a Forrester methodology that demonstrates how cybersecurity spending directly affects revenue. Security leaders can use it to defend their security budgets to the board, the C-suite, and other stakeholders.