Second, this one-time price increase of one or two cents would be so small, relative to the prices of the items that make up the basket of goods and services priced by the total consumer price index (CPI) that it would not register on that index since the CPI is rounded to the nearest 0.1 per cent.
Third, it is very unlikely that prices would be rounded up, since such rounding would not carry through to the cash register after sales taxes are applied, and retailers would lose the perceived marketing benefit of posting a price that ends in 9 cents.