Yes. In certain cases, an increase in demand does not affect prices in ways predicted by the law of demand. For instance, so-called Veblen goods are things for which demand increases as their price rises, as these are perceived as status symbols. Similarly, demand for Giffen goods (which, in contrast to Veblen goods, are not luxury items) rises when the price rises and falls when the price falls. Examples of Giffen goods can include bread, rice, and wheat. These tend to be common necessities and essential items with few good substitutes at the same price levels. Thus, people may start to hoard toilet paper even as its price goes up.