Consider the file named HW8 Public Goods. It shows the marginal private benefits (MPB) derived by three citizens from different units of a public good such as a fire station, another military base, or a new freeway. It also shows the marginal social costs of building these public goods. The allocatively efficient number of the public good is Use our general rounding rule. Citizen 1's MPB $25 $24 $23 $22 $21 $20 $19 $18 $17 $16 0 2 3 5 6 7 8 Citizen 2's MPB $27 $26 $25 $24 $23 $22 $21 $20 $19 $18 0 1 2 3 5 6 7 8 Citizen 3's MPB $51 $50 $49 $48 $47 $46 $45 $44 $43 $42 $41 $40 $39 $38 $37 0 2 3 4 5 6 7 8Marginal Social Cost $92 $88 $84 $80 $76 $72 $68 $64 $60 $56 $52 $48 $44 $40 $36 $32 $28 $24 $20 $16 0 2 3 4 5 6 7 8