Economists Regard Events from the Past as

Economists regard events from the past as

A) irrelevant, since history is unlikely to repeat itself.
B) of limited interest, since those events seldom provide any useful economic data.
C) interesting but not particularly valuable, since those events cannot be used to evaluate present-day economic theories.
D) interesting and valuable, because those events are capable of helping us to understand the past, the present, and the future.