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The price index change is just "rebasing". It happens all the time to make price index numbers readable (so indexes don't climb to like 5000). No information is loss.
You can get pre-2010 data that is comparable with the new index by dividing the old series by the 2010 index number and combining it with the new series. E.g. if under the old series 2009=280, 2010=300, then under the new series 2009=93.3, 2010=100.
Statistics Canada's Attention Deficit Disorder
This happens all the time: With the release of November 2013 data, Statistics Canada converted the Industrial Product Price Index (IPPI) and the Raw Materials Price Index (RMPI) series to 2010=100, with 2010 as the base year. These indexes have also been updated using a weighting pattern based ...
Why can you not solve the non-random model?
I'm not an economist, but a mathematician, and pretty much any system of differential equation can be solved numerically with well-known techniques.
What about a numerical solution instead of a analytical solution?
Microfoundations we like vs microfoundations we can solve
Take just one example: the Calvo pricing model. In that model, the Calvo fairy visits each firm at random, taps it with her wand, and lets it change its price. The probability of her visiting in any period is 1/n, so she visits each firm on average every n periods. Firms know this and set prices...
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