Final answer:
Efficiency loss occurs when the sum of U and W is less than the maximum.
Step-by-step explanation:
The question you asked relates to efficiency loss in the field of Economics. Efficiency loss occurs when the sum of U and W is less than the maximum. In economics, deadweight loss refers to the loss in social surplus that occurs when an economy produces at an inefficient quantity. This inefficiency results in a reduced total surplus of society, which is like money thrown away that benefits no one.