Suppose barbara looks out in the morning and sees a clear sky so decides that a picnic for lunch is a good idea. last night the weather forecast included a 100% chance of rain by midday but barbara did not watch the local news program. is barbara's prediction of good weather at lunch time rational? why or why not?

As more people migrated west during the gold rush, what do you think happened to the demand curve in most western markets, holding all else constant? a. there was no shift, nor any increase or decrease in quantity demanded. b. there was no shift, but there was a decrease in quantity demanded. c. the demand curve shifted to the left. d. the demand curve shifted to the right. e. there was no shift, but there was an increase in quantity demanded.