The law of demand states that A. if prices, incomWhich of the following would cause an increase in the demand for fish? A. An increase in the number of firms in the market. B. Upper A decrease in consumer incomes (fish is a normal good). C. Upper A decrease in the price of fish. D. An increase in the price of chicken, a substitute for fish.e, and the price of other goods increase, demand will increase. B. as price increases, quantity demanded increases, all other things equal. C. supply creates its own demand. D. if supply increases, demand will increase to meet supply. E. as price increases, quantity demanded decreases, all other things equal