"If the price of a packet of biscuits stays at EUR 1.20 but its size is reduced from 300g to 250g, this is treated as a change in quality: the price index should show an increase as there are fewer biscuits in the packet but the amount paid for the packet is the same."
"If the price of a packet of biscuits stays at EUR 1.20 but its size is reduced from 300g to 250g, this is treated as a change in quality: the price index should show an increase as there are fewer biscuits in the packet but the amount paid for the packet is the same."
I'm dubious.
ec.europa.eu/eurostat/statistics-explained