Expert Q&A Done Fred takes one hour to make a BB, 1 hour to make a DD and has 8 hours of labor. Bamm-Bamm takes one hour to make a BB, 2 hours to make a DD and has 8 hours of labor. 1. Construct a joint PPF using Fred and Bamm-Bamm. 2. Find the terms of trade for Fred and Bamm-Bamm. Fred retires and is replaced by Pebbles. Pebbles takes 2 hours to make a BB, 2 hours to make a DD and has 8 hours of labor. 3. Construct a joint PPF using Bamm-Bamm and Pebbles. 4. Show both joint PPF on the same diagram and explain what caused the change in PPF