The following situations relate to the demand curve for iPhones [normal good]. For each situation, state whether it is a change in quantity demanded or a change in demand. For every ‘change in demand’ indicate whether the change is an increase in demand or a decrease in demand as it relates to the quantity demanded/demand for iPhones now. (a) Income statistics show that income of 18–25-year-olds have increased by 10 Percent over the last year. (b) Apple announces that it will introduce a new, improved and cheaper iPhone to go on sale next month (c) Believing that it has significant control of the market for smart phones, Apple decides to raise the price of iPhones with the goal of increasing profits. (d) The price of Android phones, a substitute for the iPhone, decreases. In