Last week, the Lok Sabha passed four crucial Bills to introduce a country-wide GST, which would take India closer to being a one unified market. GST will create a common national market by replacing a string of central and local taxes such as excise, value-added tax, octroi, and service tax into a single unified levy. Here’s a look back at how GST took shape over 11 years, three governments, and three finance ministers championing the cause