Here are 3 types of possibilities:

- A linear supply curve which has a positive intercept on the vertical axis is elastic at every point.

- A linear supply curve which has a negative intercept, is inelastic at every point.

- And a linear supply curve which has an intercept of zero, goes through the origin, is unit elastic at every point. For every point on that curve, the elasticity equals 1.

- A linear supply curve which has a positive intercept on the vertical axis is elastic at every point.

- A linear supply curve which has a negative intercept, is inelastic at every point.

- And a linear supply curve which has an intercept of zero, goes through the origin, is unit elastic at every point. For every point on that curve, the elasticity equals 1.