A riskless arbitrage in which a discount option is purchased and an opposite position is taken in the underlying security. The arbitrageur may either buy a call at a discount and simultaneously sell the underlying security (basic call arbitrage) or may buy a put at a discount and simultaneously buy the underlying security (basic put arbitrage).
See Also:
Arbitrage: The simultaneous purchase and sale of two different, but related, securities with the intent of profiting by the price discrepancy.
Discount: An option is trading at a discount if it is trading for less than its intrinsic value. A future is trading at a discount if it is trading at a price less than the cash price of its underlying index or commodity.