Prepaid 529 college investment plans are those which are purchased at whatever the current tuition rates may be.  The performance of these plans depends simply upon whether or not tuition rates experience inflation.  If so, then the 529 college investment you make will grow to match and keep up with the rise in tuition.  These plans often have the benefit of being state-guaranteed, and allow parents to rest easy knowing that if they invest in a child’s education now, the value will still match up with costs later.