A firm publishes and sells books. The diagram shows a shift in the firm’s supply curve from ${S_1}$ to ${S_2}$.
What would have caused this shift in the firm’s supply curve?

1 )
a fall in the subsidies paid to book publishers
a fall in the price of paper
3 )
a rise in the real income of customers
4 )
a rise in the wages of the firm’s workers
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