Modern Finance is Valuable and Simple and useful when all the variables are known... It breaks down when you encounter unknown / unknowable variables...

 That's why we consider it a subset of Modular-Finance - because the future is unknowable ... and that's what makes finance different

and when you factor in the human element / Radical uncertainty / 

The Great Wake-up call - Gillian Tett

Queen Elizabeth etc

Alan Greenspan