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+Bull Call Spread
+A bull call spread is a long call combined with a short call that has a higher
+strike price. Both calls are on the same underlying and share the same
+expiration month. Because the purchased call has a lower strike price, it
+costs more than the call being sold. Establishing the trade results in a debit
+to the trader’s account. Because of this debit, it’s called a debit spread.
+Below is an example of a bull call spread on Apple Inc. (AAPL):
+In this example, Apple is trading around $391. With 40 days until
+February expiration, the trader buys the 395–405 call spread for a net debit
+of $4.40, or $440 in actual cash. Or one could simply say the trader paid
+$4.40 for the 395–405 call.
+Consider the possible outcomes if the spread is held until expiration.
+Exhibit 9.1 shows an at-expiration diagram of the bull call spread.
+EXHIBIT 9.1 AAPL bull call spread.
+Before discussing the greeks, consider the bull call spread from an at-
+expiration perspective. Unlike the long call, which has two possible