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+INTRODUCTION 
+A put option gives the holder the right to sell the underlying security at the striking 
+price at any time until the expiration date of the option. Listed put options are 
+slightly newer than listed call options, having been introduced on June 3, 1977. The 
+introduction of listed puts has provided a much wider range of strategies for both 
+conservative and aggressive investors. The call option is least effective in strategies 
+in which downward price movement by the underlying stock is concerned. The put 
+option is a useful tool in that case. 
+All stocks with listed call options have listed put options as well. The use of puts 
+or the combination of puts and calls can provide more versatility to the strategist. 
+When listed put options exist, it is no longer necessary to implement strategies 
+involving long calls and short stock. Listed put options can be used more efficiently 
+in such situations. There are many similarities between call strategies and put 
+strategies. For example, put spread strategies and call spread strategies employ sim­
+ilar tactics, although there are technical differences, of course. In certain strategies, 
+the tactics for puts may appear largely to be a repetition of those used for calls, but 
+they are nevertheless spelled out in detail here. The strategies that involve the use 
+of both puts and calls together - straddles and combinations - have techniques of 
+their own, but even in these cases the reader will recognize certain similarities to 
+strategies previously discussed. Thus, the introduction of put options not only 
+widens the realm of potential strategies, but also makes more efficient some of the 
+strategies previously described. 
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