The National Financial Conditions Index is a comprehensive weekly macroeconomic gauge published by the Federal Reserve Bank of Chicago that provides a broad indicator of financial health across U.S. money markets, debt and equity instruments, and traditional or shadow banking systems. By aggregating over one hundred distinct financial variables, the index measures whether financial conditions are tighter or looser than historical averages. Positive values reflect tighter conditions with constrained credit, while negative values indicate supportive, loose financial environments that encourage borrowing and economic growth.