Help pls. eco p1

[skipowder]

Can somebody explain why the answer is D (in the markscheme) not B ? It's Economics P1 May/June 2009
thanks in advance

15. A town council estimated the costs and benefits of operating a bus service in 2006 and 2007.
These are shown in the table.
2006 2007
$000 $000
private costs 2000 2200
external costs 500 900
private benefits 1500 2300
external benefits 1000 800

What can be concluded from the table?
A Between 2006 and 2007, social costs fell and social benefits rose.
B Between 2006 and 2007, social costs rose and social benefits fell.
C In both years, positive externalities exceeded negative externalities.
D In both years, social costs equalled social benefits.

 

[dipikey]

sure its not B
private costs 2000 2200
external costs 500 900
private benefits 1500 2300
external benefits 1000 800

2006= 1500+1000=2500
2007= 2300+800= 3100

you can see that social benefit rise

and the answer should be D because:

social cost 2006= 2500
social cost 2007= 3100
social benefit 2006= 2500
social benefit 2007= 3100

as you can see that the social cost and social benefits 2006 and 2007 are equal