I estimate the effects of two Canadian internal trade liberalizations on plant-level productivity, markups, and exports. In particular, I examine the New West Partnership and Trade Agreement (NWPTA) and the Trade and Cooperation Agreement (TCA), both of which sought to reduce or remove prohibitive, technical and administrative barriers to trade across provinces. Employing a control function approach, I use Canadian manufacturing data to estimate plant-level total factor productivity and markups for 2004-2012. Then, using difference-in-differences methods, I find that the NWPTA increased…