How can conserving material increase productivity? a. Since good productivity includes costs, conserving material can save tremendous costs by avoiding wasted material. b. Making careless mistakes can lead to re-doing work, which not only wastes material but may take longer to complete the project. c. Conserving material also includes using the correct material to avoid rework or the possibility of losing a good customer because of a defective or poor quality product. d. A and C only e. All of the above