There's just a huge number of securities you can trade now. Most equities have monthly options (so e.g. about ~50 calls & puts * 6 months) and the indices have

There's just a huge number of securities you can trade now. Most equities have monthly options (so e.g. about ~50 calls & puts * 6 months) and the indices have weekly now. And those are just the basic derivatives, the OTC stuff gets even crazier.