[entropy12]

https://en.wikipedia.org/wiki/Economic_history_of_India

“According to economic historian Angus Maddison in his book Contours of the world economy, 1–2030 AD: essays in macro-economic history, India had the world’s largest economy during the years 1 AD and 1000 AD.[17]”

[SeeSharp]

India had the world’s largest economy during the years 1 AD and 1000 AD.

Keep in mind though, during that time period "India" was little more than a geographic expression. See Middle kingdoms of India.