a) There is no clear evidence from the Quran and Sunnah that the Muslim shall use and adopt the dirham in their transaction.
b)However, it is preferable to use the dinar and dirham as the gold and silver are the most stable currency since its emergence until the recent era.
c) Not only the paper money which is subject to the inflation, gold and dinar is also fluctuating. The simple example is that: a hundred grams of gold which has a purchasing power to buy a hundred square yards of land, it may happen that after 10 years the purchasing power of gold turns out to be only fifty yards.
d) The medium of exchange is not limited to gold or silver and the barter of commodity is not confined to specific articles such as gold, silver, etc, so paper money is possibly used as medium of exchange.
e) It is indispensable reality in this era to use paper money for our medium of exchange as every corner of the world atmosphere obliges us to be involved in using such instrument.