In the diagram, D is the demand curve of an agricultural commodity and S is the initial supply curve.
The government promises to maintain farmers’ incomes at least at this initial level. The harvests in four subsequent years are shown by supply curves ${S_1}--{S_4}$.
How much in total will the government pay to support farmers over the four subsequent years?
1 )
$0
2 )
$3000
$6000
4 )
$10000
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