The word 买家 is formed by directly combining two meaningful characters: 买 (mǎi), which means "to buy", and 家 (jiā), which in this context acts as a suffix denoting a person or entity specializing in a certain role. They are joined in a straightforward, modular way where the first character defines the action (buying) and the second character defines the agent who performs it, resulting in the compound concept of "the buying party" or "buyer".