Market maturity plays a part. But in the field of economic statistics, markets can take decades and longer to reach 'maturity'. Autos, for example, is a mature market segment. Autos have been around for over 100 years. By comparison, digital cameras have been popular for about 10 - about the same length of time as flat screen TV's have been popular. I got my first computer when I was in university, about 27 years ago. I can buy a much better laptop today than I could 4 years ago when I got the one I have now and do it for much less money. I just bought a new desktop a few weeks ago. Far and away a superior machine to what I had previously and for $400 less than I paid then. Further, the numbers are calculated on a huge number of products so one single item, such as large screen TV's couldn't dominate. Further still, something like electronics would have a pretty low proportion in the overall weighting of inflation so, again, it could not dominate. As of around 6 years ago in the U.S., housing costs made up 29% of the CPI calculation, for example. There's more to the calculation of inflation than just numbers; however. Hedonics play a part. I'm not sure what impact hedonics would have on the component of the CPI that digital cameras would be a part of. Might be an increase or a decrease in price, but probably a decrease. As of that same, about, 6 year ago time hedonics was only used in 7 of the 211 components of the CPI, and I don't know if electronics is one of those. Each of those 211 components will be made up numerous sub-components.