Give a short introduction to development banks.

Development banks are financial institutions established to lend (loan) finance (money) on the subsidized interest rate. Such lending is sanctioned to promote and develop important sectors like agriculture, industry, import-export, housing, and allied activities.

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.