During recessions natural real GDP

Ryan saved $50,000 last year in his bank account so that he could buy a car this year. In this case, money served the function of a ________

A) unit of account B) means of deferred payment C) store of value D) medium of exchange

People on welfare often face the highest marginal tax rates of anyone because ______

a. of our regressive income tax system b. of the non-deducibility of state sales taxes c. of the loss of entitlement payments when earning additional income d. of increasing marginal utility of income