India is one of the largest producers of tractors in the world. ${S_1}$ and ${D_1}$ are the original supply and demand curves for Indian tractors.
What would cause the supply curve to move to ${S_2}$?

1 )
a rise in the incomes of Indian farmers
2 )
a rise in the price of electricity paid by Indian tractor manufacturers
3 )
a rise in the price of tractors produced in the US
a rise in the productivity of workers in Indian tractor factories
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