Price gouging refers to a sharp, temporary increase in the price of items that are in high demand because of a civil emergency, without a generally-recognized justification or in breach of contract. The term is distinguished from profiteering by being short-term and localized, and by a restriction to essentials such as food, clothing, shelter, medicine and equipment needed to preserve life, limb and property. In many jurisdictions, price gouging is a felony.
In a market economy, laws against price gouging are justified as a valid exercise of the police power to preserve order during an emergency, and may be combined with anti-hoarding measures. The usual argument is fourfold.
The community as a whole may well possess sufficient stocks to sustain it through the emergency, provided that panic can be avoided. Sharp increases in price may trigger such panic.
When people's resources are strained by a situation beyond ordinary prudence, the corrective tendencies of the market are too slow and communication too uncertain.
In an emergency, ordinary legal protections are impractical. Thus, refusing to sell lumber at an advertised price may constitute fraud and refusing to honor a reservation may constitute a tort, but the harm is likely to be irreparable long before a case can be brought.
Regardless of theory, when people become desperate, public order becomes precarious. Emergency services are likely to be strained by both increased need and reduced capacity. Riots by otherwise law-abiding citizens could prove overwhelming.
Exceptions are generally made for price increases that can be justified in terms of increased cost of supply, transportation or storage. Statutes generally give wide discretion not to prosecute: in 2004, the State of Florida determined that one-third of complaints were unfounded, and a large fraction of the remainder were handled by consent decrees, rather than prosecution
http://en.wikipedia.org/wiki/Gouging