What document did justice black criticize as part of his argument in the dissent

It was due process.  He believed that it covered too much scope.  For him, it denies Congress the ability to make laws on the basis of their judgment and this is given to the courts. He wanted a more limited definition of due process which many of his co-judges did not agree with.

he risk-return relationship. generally, the higher the potential return of an investment, the higher the risk. there is no guarantee that you will actually get a higher return by accepting more risk. diversification enables you to reduce the risk of your portfolio without sacrificing potential returns.

explanation:

social contract theory, nearly as old as philosophy itself, is the view that persons' moral and/or political obligations are dependent upon a contract or agreement among them to form the society in which they live