Here's another example that you might be more familiar with : let's say that year N there is a specific laptop available for sale for $1200. Year N+3 you can st

Here's another example that you might be more familiar with : let's say that year N there is a specific laptop available for sale for $1200. Year N+3 you can still find for sale that laptop which still costs $1200 but which has improved guts and is twice as fast as before. Has the price of laptops stayed the same or gone down ? From the point of view of CPI calculation, it has gone down.