sentences:  The growing payrolls of factories were nearly impossible to meet for employers with no supply of coins.At the same time, the population growth rate of Great Britain between 1750 and 1800 nearly quadrupled.The situation was only made worse by the outflow of British silver coins via Gresham's law, the preponderance of counterfeit copper coins in circulation, and the Royal Mint's sporadic production of non-gold coins from the late 17th century to the late 18th century.