The majority of the students in the school where tanya teaches live below the poverty level. many come to school without having had breakfast, and so have a hard time focusing on what tanya is teaching until after lunch. for the first half of the day these students are motivated by needs.

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.