Now you have extra justification for taking a holiday road-trip every year!
Black and Scholes invented their equation in 1973; Robert Merton supplied extra justification soon after.
But for those of us looking for just that little extra justification to go easy on the dusting - and the price point to indulge - a little economic rebalancing doesn't hurt.
There is an additional justification.
At the Project Syndicate, Santiago Zabala favors a Protagorean answer: philosophy cannot legitimate politics — if legitimation is conceived of as providing an extra-political justification for our social arrangements.
"There's an extra layer of resistance, or justification, when you are dealing with an institution that has a religious basis for being opposed to same-sex marriage," she said.
Osborne's justification for raising an extra £900m a year from the bank levy seems reasonable: during the financial crisis the UK bent over backwards to support the banking industry, not only pure domestic lenders, so he would like the public purse to see a tangible benefit.
Consequently, gaining an extra skill or two would not have hurt in the promotional justification considering additional skills are an added value to the organization's growth and productivity.
In addition, the introduction of HIV activities allowed the justification to program managers of extra resources that were in fact already needed (e.g. an extra doctor, extra laboratory resources).
Malcolm Clarke, chair of the Football Supporters Federationn, said there was "no justification" for any increases in the top flight given a new television deal that is bringing in an extra £600m across the division.
