The 4 Ms of Management
Manpower - Without manpower you are unable to get your work done. Untrain man can cause damage to goods.
Method - Wrong method of doing the jobs can be expensive because you may not be able to attain the results.
Machine - If your machine of inferior quality it may take a longer process to get the work done and therefore time equals to money. Break down of machinery is down time and that cause is higher. You need to pay your manpower and pay for repairs and materials maybe perisable.
Materials - Quality of material - use the material of different quantity or quality can affect the end results causing a loss.