The diagram shows a shift in a firm’s supply curve from ${S_1}$ to ${S_2}$.
What may have caused the shift from ${S_1}$ to ${S_2}$?
1 )
a decrease in the costs of production of the firm
2 )
a decrease in the popularity of the firm’s product
a decrease in the subsidy on the good
4 )
a decrease in the tax on the good
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