A black market or underground economy is a market in which goods or services are traded illegally. The key distinction of a black market trade is that the transaction itself is illegal. The goods or services themselves may or may not be illegal to own, or to trade through other, legal channels. Because the transactions are illegal, the market itself is forced to operate outside the formal economy that is supported by the established state power. Common motives for operating in black markets are to trade contraband, avoid taxes and regulations, or skirt price controls or rationing. Typically the totality of such activity is referred to with the definite article as a complement to the official economies, by market for such goods and services, e.g. ""the black market in bush meat"".The black market is distinct from the grey market, in which commodities are distributed through channels which, while legal, are unofficial, unauthorized, or unintended by the original manufacturer, and the white market.The black market is considered a subset of the informal economy, of which 1.8 billion people worldwide are employed or which makes up 15-17% of world GDP (averages over 1999-2007, weighted by total GDP in 2005).Black markets have online counterparts consisting of darknet market websites such as the Silk Road, individual websites, forums and chat rooms. While overlaps exist, the online markets are focused on specific areas including drugs, compromised credentials, malware, digital goods and weapons. Piracy specifically takes place on private or public warez and BitTorrent sites as well as various peer-to-peer file sharing networks.