Australia's superannuation retirement savings pool is enormous. At two and a half trillion dollars, it's one of the largest in the world. But there are fears that even that huge sum of money won't be enough. Millennials are entering a very different workforce from the one that existed 30 years ago when compulsory superannuation was adopted. In the broader economy, it's estimated that between three and six billion dollars' worth of super entitlements per year are not being paid. Now there are calls to take a fresh look at super and make some major reforms.