Sometimes countries adopt new currencies which are not their own as a medium of exchange. The reasons for this vary but often this is as a response to a macroeconomic crisis. In January 2009, Zimbabwe adopted a new currency after experiencing a decade of hyperinflation and economic crisis. The change in currency had positive effects for inflation – Zimbabwean inflation dropped to -3.4 percent two months after the change, but came with other challenges. The most obvious is a loss of monetary policy control. A less obvious one has to do with the stickiness of prices. In most cases the adopted currency is ‘strong’ in value but less fine in terms of denominations (the face value of the currency). The ‘coarseness’ of the new currency denominations means that prices are likely to be more sticky as retailers have limited scope to change prices as a response to smallish economic shocks, especially for lower priced products. This matters because it introduces another source of rigidity into the economy and may have distributional effects if it impacts certain groups of consumers more than others (for example the poor who may disproportionally buy goods with low face-values). This type of challenge has been overlooked in the literature.