“In a free market economy from which fiduciary media are excluded, economic progress will be limited, perhaps severely, by the high cost and correspondingly limited supply of small-denomination money—money that is needed to accomplish retail and other low-value exchanges. Historically, fiduciary token coins have proven to be the only practical means for addressing the small change problem, whether officially or unofficially. In particular, privately-supplied, fiduciary token coins played a crucial part in Great Britain’s Industrial Revolution, which might not have been possible without them.” Read more. 

“100 Percent Reserve Money: The Small Change Challenge” 
George Selgin 
Quarterly Journal of Austrian Economics, Vol. 12, No. 1 (2009): 3-16.
Via the Ludwig von Mises Institute.