購 is built from the 貝 and 冓 (framework (in 構·講)) components.
It belongs to a phonetic family with 構, 講, and 溝 — they share the 冓 component and the reading コウ.
A common word using 購 is 購読 (こうどく), meaning “subscription”.
Don't confuse it with 講, 構, and 溝.
