Exchange: A central marketplace with established rules and regulations where buyers and sellers meet to trade futures and options contracts or securities. Exchanges include designated contract markets and derivatives transaction execution facilities.
Liquidity: Liquidity (Liquid Market) is a characteristic of a security or commodity market with enough units outstanding and enough buyers and sellers to allow large transactions without a substantial change in price.
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Naked options trading is very risky - many people lose money trading them. It is recommended contacting your broker or investment professional to find out about trading risk and margin requirements before getting involved into trading uncovered options.