ABSTRACT This research aims to 1) Identify which sectors are the base and non-base sectors in Siak Regency from 2019 to 2023 using a location quotient approach. 2) To understand how the changes and shifts in the economic structure of Siak Regency occur using a Shift Share approach. 3) To determine which sector plays the most dominant role in the economy of Siak Regency from 2019 to 2023. T…