This is precisely what the Bank of Canada and other central banks have been doing over the past year and a half. From August 2007 to August 2008, the Bank of Canada made two significant changes to support liquidity, and thereby the stability of the Canadian financial system and the efficient functioning of financial markets.
In surveys, consumers have repeatedly voiced concern that the changeover to the new currency will be taken as an opportunity by retailers to raise prices. This holds true for the popular signal prices like DM0.49 or DM1.99, for example, by which a clean price threshold is avoided. Owing to the crooked conversion rate, the conversion will result in crooked prices.