Simple as three rubles in rubles

Quote Explanation: When the Russian Empire got involved in the First World War, it instantly led to an economic crisis and the loss of first silver money, and then copper trifles. In return, in 1915, the government issued paper stamps with various denominations in pennies. Three-kopeck stamps were quite easy to forge in comparison with banknotes of larger denominations, three rubles in this proverb is the result of a kind of "inflation". Initially, the expression sounded still "simple as three pennies."