GDP releases can move markets within minutes. Here is why investors react so strongly, and what actually drives that reaction.

GDP measures production, not progress. Here is what it leaves out, and why treating it as a complete scorecard is a mistake.

GDP isn’t counted directly — it’s built from a formula. Here is exactly how the expenditure and income approaches work, explained simply.

A GDP growth number by itself doesn’t say much. Here is how to interpret it — healthy, overheating, or heading toward contraction.

Nominal GDP can rise even when an economy produces nothing more. Here is how real GDP strips out inflation to show what actually changed.

GDP is the headline number used to describe the size and health of an economy. This guide explains what it actually measures, how it’s built, and why it matters.