Is it Really Different this Time?

<p>Whenever investors take things to extremes, it seems we always hear the excuse: "this time is different." While that may or may not be case, what should investors do when this becomes the prevailing wisdom? Are things really that different or are we using the new difference as rationale to behave stupidly? In this week's Trading Perspectives, John and Sam take a look at some recent, and some not so recent, times when "this time really wasn't as different as we really thought." </p>