U. s commonwewealth is what

Commonwealth is a term used by two unincorporated territories of the United States in their full official names. The territories are the Northern Mariana Islands and Puerto Rico (which, in Spanish, officially calls itself the 'Free Associated State of Puerto Rico').

by using  production possibilities graph.  opportunity costs are key expenses in financial matters and are utilized as a part of registering money saving advantage investigation of a venture. such expenses, be that as it may, are not recorded in the record books but rather are perceived in basic leadership by processing the money costs and their subsequent benefit or misfortune.