Imagine an economy in which: (1) pieces of paper called yollars are the only thing that buyers give to sellers when they buy goods and services, so it would be common to use, say, 50 yollars to buy a pair of shoes; (2) prices are posted in terms of yardsticks, so you might walk into a grocery store and see that, today, an apple is worth 2 yardsticks; and (3) yardsticks disintegrate overnight, so no yardstick has any value for more than 24 hours. In this economy,
a. the yardstick is a medium of exchange but it cannot serve as a unit of account.
b. the yollar is a unit of account, but it is not a medium of exchange and it is not a liquid asset.
c. the yardstick is a unit of account but it cannot serve as a store of value.
d. the yardstick is a medium of exchange but it cannot serve as a store of value, and the yollar is a unit of account.

Ticker services began operations in 2015 and maintains long-term investments in available-for-sale securities. the year-end cost and fair values for its portfolio of these investments follow.portfolio of available-for-sale securities cost fair valuedecember 31, 2015 $ 369,060 $ 357,988 december 31, 2016 420,728 445,972 december 31, 2017 572,190 676,901 december 31, 2018 864,007 768,966 prepare journal entries to record each year-end fair value adjustment for these securities.calculation adjustment required to fair value adjustment.12/31/15 existing balance in fair value adjustment-afs (lt) required balance in fair value adjustment-afs (lt) adjustment required to fair value adjustment-afs (lt) 12/31/16 existing balance in fair value adjustment-afs (lt) required balance in fair value adjustment-afs (lt) adjustment required to fair value adjustment-afs (lt) 12/31/17 existing balance in fair value adjustment-afs (lt) required balance in fair value adjustment-afs (lt) adjustment required to fair value adjustment-afs (lt) 12/31/18 existing balance in fair value adjustment-afs (lt) required balance in fair value adjustment-afs (lt) adjustment required to fair value adjustment-afs (lt) record the year-end adjusting entry for the securities portfolio as of december 31, 2015.date general journal debit creditdec 31, 2015 record the year-end adjusting entry for the securities portfolio as of december 31, 2016.date general journal debit creditdec 31, 2016 record the year-end adjusting entry for the securities portfolio as of december 31, 2017.date general journal debit creditdec 31, 2017 record the year-end adjusting entry for the securities portfolio as of december 31, 2018.date general journal debit creditdec 31, 2018