Option trading basics
OK, let’s cover some basics about option trading. First of all, there are call options and put options. A call option will go up in value when the underlying security goes up in value, and a put option will do the opposite… it will go up in value when the underlying security goes down in value.
Ohhh, wouldn’t it be nice if option trading was that simple? Unfortunately, it isn’t. There is this whole idea of time decay and volatility. It is entirely possible to but a call option on a stock, then sit back and watch the underlying stock go up in value while your call option LOSES value….
How can this happen? Well, the explanation gets a little complicated, but the deal is like this… an option is only good for a certain period of time. For instance, let’s say three months. When you buy the call - let’s say it is a stock option - the underlying stock is at 60. Your option has a strike price of 70. That means you can buy the stock at 70 by using your call option.
Obviously, with the price at 60, you are not going to want to excercise your option and buy the stock at 70. But you are betting that the stock’s price will go up above 70 in the three months before the option expires. In that case, your option will be in the money.
If it is a strong stock and a strong market, then maybe you figure the odds are pretty good it will get above 70 in those next three months before the option expires. But what if you only had two days before the option expired… all of a sudden your odds go way down.
And that is what is underlying the whole idea of time decay. With three months left, that option is worth a lot more than what it is if there are only two days left.