When you make a routine, everyday decision it is called

The figure above shows a preference map for Sarah, who likes hamburgers and milk shakes

a) Which two combinations contain the same amount of hamburgers but different quantities of shakes? b) Which combination(s) does Sarah most prefer? Why? c) Which combination(s) does Sarah least prefer? Why? d) Between which combinations is Sarah indifferent? Why?

The main reason(s) firms in a competitive market cannot earn positive profits in the long run is(are)

a. assets can quickly move in and out of the industry when demand fluctuates b. an increase in demand leads to entry of firms which absorb the extra demand c. a decrease in demand leads to exit of firms from the market such that there is no surplus d. all of the above