Stuck on 2 Multiple choice questions. Labor economics related. Please help thanks.

Instead of a wage increase following a crime surge in the city, members of a police union agreed to keep the same pay in exchange for a new 20-year retirement program. What is this an example of? Check all that apply. Note: points are awarded for correct answers and subtracted for wrong answers. efficiency Pareto optimality C] fringe benets C] compensating wage differential Why might an employer use an incentive scheme rather than attempt to measure worker productivity? 0 Worker productivity can be determined by objective measures. 0 It is inexpensive to determine worker productivity over time. Q Worker productivity is subjective. O Worker productivity is an example of hard information. Q Worker productivity is not based on effort