Use the Calmfors-Driffill model to determine whether the following statements are true, false or uncertain. Briefly explain your answer.

(a) Industry level unions face more inelastic product demand than firm-level unions

(b) Industry level unions take into account their effect on the economy-wide price level when negotiating wages

(c) Centralized wage setting secures the lowest level of unemployment because centralized unions have the most bargaining power

(d) The hump-shaped (inverse \(U\) ) relationship between centralization of wage setting and unemployment would be more pronounced in an open economy than in a closed one.