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 ${S_1}-{S_4}$.
In which years will the government need to provide extra income to farmers?
1 )
1 and 2
1 and 4
3 )
2 and 3
4 )
3 and 4
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