A black market or underground economy is the 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 may or may not themselves 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, supported by the established state power. Two common motives for operating in black markets are to trade contraband, or to avoid taxes or price controls. 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".