In the diagram, the curve shows the various combinations of labour and capital that can be employed to produce a given volume of output.
A firm initially chooses the combination of labour and capital shown by point X on the curve. In a subsequent period the firm chooses the combination of labour and capital shown by point Y.
What could explain this change?

1 )
a decrease in capital productivity
2 )
an increase in labour productivity
an increase in the cost of labour
4 )
an increase in the cost of capital
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