Question 7 1 Point A leftward shift in the demand curve for potatoes could be caused by A fall in agricultural workers wages An increase in the price of rice A fall in the price of potatoes A fall in the price of pasta Lower taxes on potato farmers Question 9 1 Point As people consume more and more of a good such as pizza they begin to find less satisfaction with the last piece than they did with the first. This principle is know as Diminishing total utility B Diminishing marginal utility The principle of demand The income effect E The excess value of a good over its price