At 21st century Nigerian is still yet to know how monetary system function, in the market trade is in all form of arrangement in transactions, although in any sound economics nation, transaction done to the nearest centimes, the buyer negotiates to the smallest amount he preferred the goods worth, and the seller bid for the highest price possible! when they get to the acceptable price, then that's the price of the goods and also the real value of the money paid!
To let this work,the money used in transaction must be in the smallest denomination to the the price of the smallest goods in the market of a given nation! The higher denomination in market force the price of the commodities upon the real value of the goods hereby rendered the money valueless, also the effect of no change leading to cheating and violated the rules of market, in which only negotiation--bid can determine the real price of any commodity!
In Nigeria market today the seller had been raised upon the buyer, they were the market gods, this is unfair and it's rendered the money valueless because, when goods value is protected by the seller, the value of the money is protected by the buyer! that's how the market function in the monetary system.
In a market where there is a goods worth's ₦1.50k, it's an abuse and violation of market rules to have ₦5 as the least denomination. It means we intentionally empowered the seller against the buyer...that is upgrade the goods value against the money value in the market! it is criminal.