Which of the following causes a movement along a supply curve?

Blue pens and black pens are close substitutes. The cross elasticity of demand for black pens with respect to the price of blue pens is ________

A) positive B) negative C) equal to 1 D) zero

Because of an expected rise in interest rates in the future, a banker will likely

A) make long-term rather than short-term loans. B) buy short-term rather than long-term bonds. C) buy long-term rather than short-term bonds. D) make either short or long-term loans; expectations of future interest rates are irrelevant.