Dan Ariely: Are we in control of our own decisions?

Opt in or Opt out
And because we have no idea what to do we just pick whatever it was that was chosen for us.
if you add an inferior option, makes the original option looks superior.
The option that was useless, in the middle, was useless in the sense that nobody wanted it. But it wasn't useless in the sense that it helped people figure out what they wanted.
because we don't know our preferences that well we're susceptible to all of these influences from the external forces: the defaults, the particular options that are presented to us, and so on.