Product lines need to be modernized. In rapidly changing markets, modernization is continuous. Companies plan improvements to encourage customer migration to higher-value, higher-price items. Marketers want to time improvements so they do not appear too early (damaging sales of the current line) or too late (giving the competition time to establish a strong reputation).
The firm typically selects one or a few items in the line to feature, possibly a low-priced item to attract customers or a high-end item for prestige. Multi-brand companies all over the world try to optimize their brand portfolios, ensuring that every product in a line plays a role. This often means focusing on core brand growth and concentrating resources on the biggest and most established brands.