Every GDP number gets scrutinized — rightly so, since it's a modelled estimate, not a cash register reading. But this quarter's 7.8% growth has a hard cross-check: GST collections, which cover nearly the entire economy except farm output, grew 14-15% for three straight months. When tax data, state-level activity, and corporate earnings all move together, that's no longer one model's assumption — it's evidence. Here's how the numbers line up.