What is an attach rate?

Attach rate refers to the ratio between the number of complementary goods or services sold in relation to each primary product sold.

For example, the sale of protective covers for mobile phones in relation to the mobile phones sold, or the sale of travel insurance in relation to the number of flights booked with an airline.

This term is relevant in the financial world and helps to measure the effectiveness of cross-selling strategies. It is important to understand the context, such as market conditions and business strategies, to correctly interpret the attach rate.