Big Mike's Health Food Store sells nutritional energy foods. The price of the products sold varies according to individual customer accounts and situations. For example, long-time customers receive discounts. This strategy is an example of ________

When is it possible for the lease rate to fall below zero?

What will be an ideal response?

Economists' attempts to explain the term structure of interest rates

A) illustrate how economists modify theories to improve them when they are inconsistent with the empirical evidence. B) illustrate how economists continue to accept theories that fail to explain observed behavior of interest rate movements. C) prove that the real world is a special case that tends to get short shrift in theoretical models. D) have proved entirely unsatisfactory to date.