In the diagram $O{S_1}$ and $O{S_2}$ are two straight-line supply curves.
As price increases, the elasticity of supply

1 )
decreases along both $O{S_1}$ and $O{S_2}$.
2 )
increases less rapidly along $O{S_1}$ than along $O{S_2}$.
3 )
increases more rapidly along $O{S_1}$ than along $O{S_2}$.
is constant along both $O{S_1}$ and $O{S_2}$.
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